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March 2015 - Welcome to ZPacks!

Most accessory items are in stock and are shipping in a day or two. Larger items like Backpacks, Shelters and Sleeping bags, and Rain Gear are made to order and are shipping in about 4-5 weeks.

If you need your order to be delivered sooner or by a certain date please email us after you order and we will schedule accordingly if possible. All ZPacks gear is made for you right here in our US workshop.
ZPacks™ "Arc Blast" Backpack

The Arc Blast is our most comfortable (and our most popular) backpack yet! Our Patent Pending Flexed Arc carbon fiber frame creates an air gap against your back. The air space keeps your back cool and also provides a buffer from any lumpy items in your pack. The curve of the frame is adjustable for optimal air flow and fit. No extra padding necessary.

The pack is constructed from tough 2.92 oz/sqyd Cuben Hybrid fabric. This material is Cuben Fiber on the inside with a protective layer of 50 denier Polyester on the outside. The outer layer gives it even more strength, prevents fraying, and gives it a nice solid color. The material and design can handle loads up to 30 lbs (14 kg).

There are three pack volumes to choose from. The torso height and belt size choices are independent of the pack volume.

45L Pack Size:
Total Volume: 45 Liters / 2,750 cubic inches - 16.0 ounces (454 grams), $275
Main Body Volume: About 32 Liters / 2,000 cubic inches
Body dimensions: 5.5" x 12.5" x 30"  (14 cm x 31.8 cm x 76 cm)

52L Pack Size (the original default size):

Total Volume: 52 Liters / 3,200 cubic inches - 16.5 ounces (468 grams), $279
Main Body Volume: About 39 Liters / 2,400 cubic inches
Body dimensions: 6.5" x 12.5" x 30"  (16.5 cm x 31.8 cm x 76 cm)

60L Pack Size:
Total Volume: 60 Liters / 3,650 cubic inches - 17.0 ounces (482 grams), $289
Main Body Volume: About 47 Liters / 2,850 cubic inches
Body dimensions: 7.5" x 12.5" x 30"  (19 cm x 31.8 cm x 76 cm)

The side pockets account for 5 Liters / 300 cubic inches and the mesh center pocket is 8 Liters / 500 cubic inches, and are included in the total volume.

Standard Features on the Arc Blast backpack:

  • Our ultralight Flexed Arc carbon fiber frame keeps the pack stiff so that most weight is carried on the hips instead of the shoulders. The frame pieces and mesh back panel can be easily removed or replaced.

    The frame is curved to allow air flow and keep your back cushioned from the pack's contents. You can adjust the curve by tensioning the mesh back panel. The recommended arch is about 2.5" (6 cm), but feel free to experiment.

    The frame now has two horizontal support bars instead of one, for more stability.
  • Roll top closure (like our dry bags) keeps water out, and lets you roll down the top as your gear load shrinks.  All seams and attachment points are taped, making the pack highly water resistant. We still suggest using dry bags for your important items like your sleeping bag.
  • Comfy 3/8" thick by 2.5" wide padded contoured shoulder straps and padded belt. Both the straps and the belt have a daisy chain for clipping on items, and an adjustable position sternum strap is also included.
  • Side pockets are sized to fit 1 or 1.5 liter bottles. They are positioned low on the pack and slanted forward for easy access without removing the pack. The pockets have drainage holes at the bottom, and elastic that keeps them tight at the top.
  • Large stretchy mesh center pocket is great for quick access items. Mesh also lets you dry wet clothing and gives you a clear view of your gear.
  • Side compression straps are made from non-stretch Dyneema cord for squishing down the pack volume. They also allow you to stand tall items like trekking poles in the side pockets.
  • A top strap, and base straps allow you to lash on extra items to the top or base of the pack. The straps come off if you don't need them.
  • A centrally located Hydration Port is included to string out a drinking tube over either the left or right shoulder. A water bladder can either be hung from an internal hang loop, or laid horizontally on top of your gear.
  • The default pack size has roughly 52 Liters / 3,200 cubic inches of volume which is enough for extended trips. The pack can be compressed down with the roll top and side straps for short trips, or use the top strap and base straps to lash extra stuff to to the outside for long carries.
  • All standard Bear Canisters, including the Bearikade Expedition and the BearVault 500 will fit in the upper half of this pack standing on end. There is enough extra girth to either wrap a foam pad around the canister (if you use one), or stand a medium stuff sack vertically beside the bear canister.
  • All ZPacks gear has a one year warranty against defects in materials or workmanship. Returns or exchanges are welcome, even on custom gear.
  • For more info check out the Backpack FAQs.

Torso Height:
The torso height measurement on our packs is the actual distance on the backpack from the bottom of the padded belt to the top of the shoulder strap attachment. If you already own a pack that you like the fit of, measure it directly from the bottom of the belt stitching to the highest point the shoulder straps are sewn.

Otherwise you can ballpark a measurement on your body using this Torso Height Measurement graphic.

Note that some backpack models attach their straps lower down, and they rely on load lifter straps to pull the shoulder straps up over the shoulder. I personally like my straps to ride about horizontally over the top of my shoulder and I skip the load lifter straps. You may want to factor that into your measurement.

Belt Length:
There are 3 belt sizes to choose from. The indicated length is the minimum belt adjustment.

Use a string or cloth tape measure to measure tight around the spot you want your belt to ride. Don't rely on your pant size.

Our medium belt has 30" of padding tip to tip. So for example if you measure 35" you could wear a medium belt with 5 inches of gap in the front for your belt buckle. A large belt (34") might not be tight enough if you loose a little weight.

Colors: New Hybrid Colors are available! Please note that Indigo looks blue in outdoor lighting (as shown) but has a purple hue to it in indoor lighting.

There is a waiting list for this item, see the notice at the top of the page.

Don't forget to scroll down through the additional options!

Arc Blast Backpack
Torso Height
Belt Length
Add Options:
Backpacks are typically built right when you order with the options you specify. Returns or exchanges are always accepted, even on custom built packs.
Top Strap

A top strap is included to lash a stuff sack or other items to the pack above the center pocket. It is made from 1/2" nylon webbing with a side release clip. The strap is detachable when not in use.

Base Straps

A pair of straps are included to lash a foam pad or other item to the base of the pack below the center pocket. The cords can be taken off.

Side Compression Straps
The side straps are made from Dyneema cord which does not stretch. They are used to compress down the pack volume, and can also be used to stand tall items such as trekking poles, an umbrella, or a fishing pole at the side of the pack.

Sternum Strap
A sternum strap made from 1/2" nylon webbing and a side release clip is included on your shoulder straps at chest level. It can be moved to any position on the straps, and it comes off if you don't need it.


The default material for this backpack is 2.92 oz/sqyd Hybrid Cuben Fiber.

We also have 4.8 oz/sqyd Dyneema X Gridstop material available. It is a bit stronger and more resistant to abrasion. It adds about 3 ounces (85 grams) to the weight of the backpack. We have it in Black as shown.

You can choose this from the color drop down above.
Belt Pouches
These pouches clip securely to the daisy chain on your padded belt. They have taped seams, a waterproof zipper, and are highly water resistant. Each pouch has about 1 liter of volume and is perfect for maps, snacks, hat and gloves, gadgets, you name it.

These are detachable and can be used on non-ZPacks backpacks as well. They are symmetrical and can be switched left or right.

Dimensions: About 6" wide, by 2" deep, by 5" tall.

Weight: .75 oz / 21 grams each  Price: $21.95 each / $41.95 per pair

Belt Pouch Details Here
Shoulder Pouches
These clip to your shoulder straps and are an excellent spot for your camera, GPS, phone, sunglasses, or other items that you want to grab quickly. Mesh on the front of the pouch gives you additional storage for small items like chap stick, keys, etc. They can also be used for .5L water bottles to counter balance a small pack.

These are detachable and can be used on non-ZPacks backpacks as well. They are symmetrical and can be switched left or right.

Weight: .5 oz  /  14 grams each   Price: $21.95 each / $41.95 pair

Shoulder Pouch Details Here
Multi-Pack - Four in One Backpack Lid / Chest Pack / Belt Pack
This four-in-one backpack accessory can be attached to the top of your pack as a lid, carried on your chest as a front pack, or worn at your hips as a fanny pack, or carried over your shoulder as a satchel.  About 3.5 liters / 215 cubic inches volume.

2.8 ounces - 80 grams   Price: $39.95

Multi-Pack Details Here

Hydration Port
A Hydration port is included by default. A drinking tube can be strung out of the pack over either shoulder. Store your water bladder horizontally on top of your gear, or hang it from a loop behind the shoulder straps.

If you do not plan to use this feature you are welcome to leave it off.

Leave Off Hydration Port - $0.01
Top Side Pockets
These pockets have a loop at each corner to connect them to corresponding loops on the sides of your pack. Since these are not sewn to the pack you can still stand tall items like trekking poles, an umbrella, or a fishing pole behind the pockets. The pockets can be taken off or added later.

The dimensions are roughly 6" wide x 3" deep x 8" tall. They are a good fit for:
-A 1 Liter or smaller pot
-A 1 Liter water bottle
-A water filter
-A poncho or light jacket
-Hat and gloves
-A NeoAir sleeping pad.

Weight: .5 oz / 14 grams each   Price: $18 each / $35 per pair

click for larger photos.

CleverHiker Top Pick!

Read the Full Arc Blast Review at
Will Wood gives a Post-Appalachian Trail Thru-hike Video Review of his Arc Blast backpack after 7 months of use.
Adventure Writer Keith "Fozzie" Foskett reports from his 2013 El Camino de Santiago thru-hike with his Arc Blast!
Read his informative review with photos.

Update- Keith has finished his second El Camino de Santiago hike in 2014. "My Arc Blast now has 1900 Miles on the clock and it barely seems worn in."
"On the impressiveness scale, I would put the load carrying abilities of the ZPacks Arc Blast, for loads in the sub 20 range, at exceptional."
Check out the full Arc Bast Review by John Abela (
Angiosperm shares his thoughts and photos in his 60L Arc Blast Review
Matt D. reviews his Arc Blast Backpack and his Hexamid Solo-Plus tent and poncho.
2012 PCT Hiker Spider Legs reviews his first generation Arc Blast Backack.
"The Tour De Mont Blanc was amazing! The Arc Blast did exceptionally well carrying all of my gear and food for 8 days of travel through the French, Italian, and Swiss Alps!" -Ben Smith (
"I just wanted to let you know that I received the pack today. I had extremely high and unfair expectations from the reviews and recommendations I had received, which the Arc Blast has (somehow) more than surpassed! This is my first ZPacks product and I am just blown away by the craftsmanship and functionality. I was expecting some imperfections from a smaller company, but the stitching and the water taped seams are just beautifully done, as is the rest of the pack. On top of all that, I just loaded it up with a lot extra gear and the weight transfer is unbelievable, couldn't really tell the difference between 1 pound and 15 pounds." -Rocky J.
"Got back from my Sequoia adventure with the Arc Blast pack. I was a little apprehensive, I didn’t think a one pound pack would handle 35 pounds, expedition canister with food for 9 days included. We weighed them with scales before heading off to trail. At that point I was committed and thought “oh boy”….
I must say this was the most comfortable pack I’ve ever used. And I’ve used ULA, Six moons, and granite gear stuff. Pleasant surprise!" -Chuck T.
"Thanks for the Arc Blast. We loved it. Best, and lightest of the breed. We used it for four days and three nights through about 32 miles and 6000ft of up and down , rain, sleet, hail, and snow without any fault or discomfort. Also, survived six airplane rides and several mad dashes through the airport with a full load. I'm sure this is nothing compared to what others have done with the pack." -Arlo A.
"I have been using the 60 liter Arc Blast backpack I purchased from you for a couple months now.  I love the pack and I think it's  the most perfect designed and constructed pack to be found anywhere.  I have shown the pack to lots of hikers and recommended it to everyone." -Chuck F.
"Your products have changed my life. I went on the most comfortable backpacking trip of my life last weekend using the Arc Blast, sleeping bag, hood, toothbrush, towels, just about everything you sell, haha. Thanks so much for the wonderful products and your amazing customer service, I will be singing your praises up and down the PCT this summer." -Otto R.
"Alyson & I can’t thank you enough for how much we enjoyed the zPacks gear during our recent walk in Spain. It’s not just the light weight – the Arc Blast packs are so well designed we just put our gear in and everything was so easy to access when we needed it." -Mark & Alyson
"The backpack was comfortable and survived the harsh environment on the Larapinta Trail in Australia. One of the most comfortable packs I have used. Just large enough for 10 days gear and dehydrated food, three litres of water and SLR camera. Start weight about 17kg." -Peter J.
"Just completed the GR-5 last week in France. The pack was fantastic, easily carrying 10 kgs, completely water resistant through every thunder storm, and unbelievably light. Thanks for a great piece of gear." -Avi. (photo)
"I seem to have (inadvertently) got the JMT southbound record time 4 days, 8 hours, 43 minutes. I used a lot of ZPacks kit on this trip - Arc Blast pack, Hexamid tarp, ZPacks sleeping bag, WPB rain jacket and kilt." -Ralph Burgess
 I am not a super-light hiker but an older guy incrementally dropping weight. I was surprised how comfortable the Arc Blast was. I expected to "give something up" in order to drop weight. Not the case with the Arc Blast! -Doug L.
"The pack is great! 6 days in the Grand Canyon loaded with water, 8 days bushwhacking in the Wind Rivers, 6 days on the AT, all loaded for the duration. Carries far more weight than you rate it for and does so well ... it's a beautiful thing and my favorite of all my packs!" -Bob M.
"The Arc Blast I got some time ago worked great at Philmont this summer, even when hauling up to 50lbs. The Scouts still haven't learned anything about light weight food, so we had plenty of canned goods and gallons of water due to the drought. The pack was uber comfortable, even under such heavy loads. Love your gear!" -Daniel L.
Disclaimer: You probably should not carry 50lbs in this pack, but it is nice to know that you could in extreme circumstances. 30-35lbs is a more reasonable upper limit.
"I just returned from a 10-day trip in the Sawtooth Wilderness in Idaho. The Arc Blast pack was wonderful. It is the best backpack that I have ever owned. Thank you for lightening my load by approximately 2 pounds from last year's trip!" -Todd G.
"I used the Arc Blast on my recent JMT thru hike. The pack performed perfectly! It was super comfortable even with 7 days food in my 12" Bearikade (about 31 lbs total weight) and shows no visible wear and tear. I actually saw several other hikers with the same pack and 100% of the people who had them loved them! I put the Bear can in the middle of the pack to avoid any  potential wear and tear on the bottom, and the weight distribution was great." -Mick P.
"Thank you for quickly sending out my new backpack to Reds Meadows. My old pack was falling apart and I was able to complete the John Muir Trail without interruption. The Arc Blast fits perfectly and was a joy to carry. Many people asked about it and we gave them your website! The Hexamid solo is still working wonderfully after 3700 miles too! Hope you continue to have great success with your business." -Jellybean
"I just finished a JMT thru-hike with a 60L Arc Blast and a Hexamid Duplex, and they both worked fantastically. The pack held my BearVault 500 with a peak weight of about 25 lbs without problem, and it still looks in good shape!" -Austin L.
"This year I was trekking in the French Alps and found Arc Blast just fantastic! It sits very well on your body, I could easily adjust the frame to regulate the distance between the pack and my back, size and placement of the side pockets is very good, my drink bottles and small snacks were very safe there. I felt like backpack was very well 'united' with my body. We were trekking through some difficult terrain and it was very comfortable, I'm really impressed. I did get some tiny scuffs on the bottom from resting it on sharp rocks, but other than that it is great. I'm so glad my friend told me of your website." -Ewa K.
"Just wanted to send a quick thanks for my Arc Blast! I have been absolutely loving it and giving it a workout. Best pack I have ever owned. Here's a view of the Chinese Wall in The Bob Marshall Wilderness." -Will F.
Key Pocket
A small pocket with a zipper is sewn inside the backpack just above the shoulder straps. This is a good spot to safely store your car keys and wallet until you get back to the trailhead. The pocket is located near the top of the pack so that you can access it w/o digging too far into your gear.

The pocket measures about 7" wide x 5.5" tall (18 x 14 cm).

Weight: .2 oz  /  6 grams    Price: $10
Ice Axe Loops
A pair of loops are attached at each corner of the pack for securing ice axes, one at each corner. The head of each axe secures through a loop at the bottom, the handle is kept tight at the top with a shock cord band. The loops can all come off when you aren't carrying axes.

Weight: .1 oz  /  3 grams    Price: $3
Load Lifter Straps
A pair of load lifter straps are sewn to your shoulder straps. Some people find these helpful to pull the top of the pack in towards their shoulders.

Weight: .2 oz  / 5.7 grams    Price: $8

Shock Cord Lashing
3/32" Shock cord is criss-crossed along the front of the backpack. It can be used to compress the pack, or to strap on items. The shock cord can be detached when not needed. It does get in the way of the center pocket a bit.

Weight: .5 oz  /  14 grams    Price: $6

Lumbar Pad
This pad slides on or off your existing belt and is held in place by two bands on the back. It is also tied in place at the center so that it can't ride up or down. This may not fit on non-ZPacks backpacks.

It is made from 2.92 oz/sqyd hybrid material matching the pack's belt.

It adds padding at your lower back and increases the air gap behind your back slightly. If your belt is just a little too large, this reduces the belt circumference by about an inch.

Weight: .6 oz  /  17 grams    Price: $12
Trekking Pole Holders
One adjustable shock cord loop is attached to your shoulder strap and another loop is attached to your belt to temporarily hold a trekking pole. These are convenient if you want to quickly stow your poles for climbing, or road walking, or other situations where you don't need your poles temporarily. You can stow them and retrieve them without stopping to remove your pack.

You can easily attach these to any older ZPacks backpacks, or other brand packs. They can be moved to either side, or you can get them on both sides.

Weight: .2 oz  /  6 grams per side    Price: $3 per side

Roll Top Dry Bags
Up to 6 size medium roll top bags will fit inside the body of the pack, and up to 3 more can be strapped on to the top and bottom of the pack for long carries. That's alot of capacity! Put your heaviest items (food, water) on the inside of the pack, and lightweight items (tent, clothes, pad) on the outside if you run out of internal space. The Large Rectangle food bag size is a good fit for this pack.

Roll Top Dry Bags

A medium cuben fiber Pack Cover, or a Pack Liner are also sized for this pack.
Custom Options
If you have made special arrangements you can enter a description and amount owed in the boxes below. You can also use this box to add notes to your order, just leave the amount at $0.


Free Shipping on U.S. orders over $100!
Otherwise shipping is just $3.95 in the U.S., $15.95 Internationally and up.

Please send us an email with any questions!

Who we are:
Joe Valesko founded ZPacks in 2005. He designed and tested all the gear, and has thru-hiked over 9,600 long distance miles including the Appalachian Trail, Pacific Crest Trail, Continental Divide Trail, Te Araroa Trail, and TGOC Scotland. Joe is available to answer any questions about gear recommendations, sizing, trail info, or anything requiring an experienced opinion.

Matt Favero receives your orders, oversees production at our shop, and ships out your orders. He has hiked much of the Florida Trail, parts of the AT, and TGOC Scotland. Matt handles most routine emails about your order. We love feedback and suggestions about our gear!

Please email us for our Address if you need to send any packages. We like to know what's coming! Our Phone Number is not listed. We are able to give a more informed answer via email, and we are normally very responsive. Please email us your questions and we will reply ASAP.