Please watch our Backpack Adjustment Video and our Backpack Torso and Belt Sizing Video.
To measure your torso height, you will need the help of friend and a string or cloth tape measure. To begin, lower your neck towards your chest. This will cause the C7 vertebra to protrude at the base of your neck. The C7 vertebra marks the top of your torso. Next wrap your hands around your love handles and then use your thumbs to feel for the top of your hipbones; also know as the iliac crest. The bottom point of your torso height measurement will be along your spine at the center point between your thumbs. Using the cloth tape measure, follow the curve of your spine from the C7 vertebra to the center of your spine at the top of your iliac crest. This measurement is your torso height.
The torso height on this pack is adjustable up and down within a range for a perfect fit. If your torso height is on the line between our choices size down. If your height is under 5' 2" (1.58 m) or your torso is under 17" (43 cm) consider the Arc Scout which is built for shorter torso heights.
To measure your belt size use a string or cloth tape measure pulled tight around the spot on your body that you want the belt to ride. Usually this will be near the top of your pelvic bone. The tape measure should be over top of your hiking pants and shirt. Do not rely on your pant size.
The belt size indicates the length of the padding on the belt, for example a Medium has about 30 inches (76 cm of padding). Each belt size has 15 inches (38 cm) of webbing for adjustment. A medium will adjust from about 30-45 inches (76-114 cm).
You want to give yourself at least a couple inches of room for adjustment.
The belt on this pack is removable and interchangeable. It can be swapped out.
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. Choose from black Dyneema Composite Fabric or black Gridstop fabric to match your backpack.
Shoulder Pouch Details
Weight: .5 oz / 14 grams each Price: $25 each / $45 pair
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. Choose from black DCF or black Gridstop fabric to match your backpack.
Belt Pouch Details
Dimensions: About 6" wide, by 2" deep, by 5" tall.
Weight: .75 oz / 21 grams each Price: $25 each / $45 per pair
Aquaclip Water Bottle Holder
The Aquaclip allows you to attach a 500ml bottle to your shoulder strap or belt. The bottle can be popped in and out easily on the go.
Aquaclip Details Here
Weight: .43 oz / 12 grams Price: $4.95
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. This will also work on non-Zpacks backpacks as long as there are loops to clip it to.
Weight: 2.9 ounces - 82 grams Price: $45
This pouch is attached to two stick-on-clips. Stick it inside your backpack as a safe place to store your car keys and wallet. We suggest positioning it towards the top of your pack, right behind the shoulder straps where it is easy to get to. Please make sure your backpack fits well before sticking this in. The adhesive bonds well with the inside of our backpack materials.
It is large enough to fit your keys, wallet, passport, or even a large phone like the iPhone 6 Plus as shown. The pouch can easily be unclipped and doubles as a large wallet around town.
The pouch itself weighs .6 ounces (17 grams) and the stick-on clips add about another .1 ounce (3 grams)
Key Pouch Details Here
Pouch Dimensions: 7.5" wide x 5" tall (19 cm x 12.5 cm)
Weight: .6 oz / 17 grams Price: $15
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 water filter
-Hat and gloves
-Our rain jacket and pants
-An inflatable sleeping pad
Weight: .5 oz / 14 grams each Price: $25 each / $45 per pair
Ice Axe Loops
A pair of loops are attached at each corner of the pack for securing ice axes. 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 - Both sides of backpack. Price: $10 / set
Trekking Pole Holders
Adjustable shock cord loops with cord locks are attached to your shoulder strap and to your belt to temporarily hold a trekking pole at either side. These are convenient if you want to quickly stow your poles for climbing, 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. These are attached to both shoulder straps, but can be easily popped off when not needed. Some people also move these up higher on the shoulder strap for securing a water bottle or umbrella.
Weight: .4 oz / 12 grams - Both sides of backpack. Price: $10 / set
Roll-Top Closure Straps
All Arc backpacks include a roll top opening by default. Normally the opening is closed by rolling it shut, and clipping a buckle together at the top of the pack.
Roll-top closure straps let you cinch the roll top down to the sides of the pack, rather than simply clipping it together. You can compress the top of the backpack down a little easier, but this is more of a cosmetic option / personal preference. If you add these you still have the freedom to secure the top of the pack the normal way by clipping the top to itself.
The straps are attached to existing loops on the backpack with toggles and they are detachable.
Weight: .5 oz / 14 grams Price: $10 / set
V Top Strap
By default there is a single webbing strap going over the top center of the backpack. A single strap works great for lashing on a soft item like a tent or a dry bag to the top of the backpack.
If you need to carry a heavier item, or a hard sided item where the strap can't dig in, you may want a V shaped top strap for more stability. This can be used to carry a bear canister on top of your pack, so long as the canister can squish into your gear as shown. Alternatively a canister can also be carried standing vertically inside the pack.
Attachment points are in place for both the normal top strap, or the V top strap and they are interchangeable. If you add this, the pack is still shipped with the normal top strap too. Detach one or the other depending on your trip's needs.
Weight: .5 oz / 14 grams Price: $10
The belt on Arc backpacks already has full-wrap padding behind your back, but this option doubles it with a detachable lumbar pad. The 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 bottom center so that it can't ride up or down. The Lumbar Pad is made with 3D mesh against your back for more cushion and grip.
If your belt is just a little too large, this reduces the belt circumference by about an inch.
The lumbar pad is about 11.5" wide by 4" tall with 3/8" closed cell foam and 3D mesh padding. (29 cm x 10 xm x 1 cm).
Most people probably won't need this option, and it can be added later if you find you want it in the future. It will also fit all older Zpacks backpacks.
Weight: 1.0 oz / 28 grams Price: $15
Shoulder Strap Pads
The shoulder straps on Arc backpacks already have 3D mesh on the underside, and most people seem to find them comfortable without any modification.
If you think you need more padding, these pads clip on over your normal straps and can be positioned right where you need them. These can be ordered later if you find that you need them down the road. They will fit most non-Zpacks backpacks as well.
Shoulder Strap Pad Details
Weight: .95 oz / 27 grams Price: $20
Roll Top Dry Bags
Up to 6 size medium or medium-plus size 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 close to your center of gravity, and lightweight items (tent, clothes, pad) on the outside if you run out of internal space. The Large Rectangle Food Bag is a good fit for this pack.
Roll Top Dry Bags
The belt on Arc backpacks is removable and interchangeable. This is a useful feature if you lose or gain weight, or if the pack is transferred to a different size person. If the belt wears out before the rest of the pack you could replace it.
The belt is attached directly to a horizontal frame bar. To remove the belt, pull out gently at the center until the frame bar bows enough to pop out of its holster at the left or right. The belt slides off the bar.
To put the new belt on:
Replacing the belt can be a bit tricky and it is not something you would want to do frequently. The spare belt includes a spare frame bar.