Our Patented Flexed Arc carbon fiber frame creates an air gap
against your back for a super comfortable fit. 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
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 35 lbs (16 kg).
The torso height
and belt size choices are independent of the pack volume.
45L Pack Size:
Total Volume: 45 Liters / 2,750 cubic inches - 20.8 ounces
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:
Total Volume: 52 Liters / 3,200 cubic inches - 21.0 ounces
Main Body Volume: About 39 Liters / 2,400 cubic inches
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 - 21.2 ounces
Main Body Volume: About 47 Liters / 2,850 cubic inches
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.
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).
The belt is attached directly to the bottom of the pack frame for the best load
The belt is removable and interchangeable. If you lose weight or need to
share the pack between people the belt can be swapped out.
The shoulder straps and load lifter straps are attached directly to the frame. Load lifters straps come standard on this pack.
The shoulder straps can move up or down to adjust the torso height to a perfect fit. It works like a conveyor belt.
This is great for sharing the pack between people, for growing teenagers, or for
The belt provides a full wrap around your back. No need for additional lumbar support.
The belt is done with "V Style" webbing so that the top and bottom
circumference can be adjusted independently. This helps wrap your
hips much more securely, and prevents the belt from sliding down.
Collectively these features provide the additional load transfer necessary for loads
up to around 35 lbs (16 kg).
Standard Backpack Features:
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
Comfy 3/8" thick by 2.5" wide padded contoured shoulder straps and padded
Both the straps and the belt have a daisy chain for clipping on
items, and an adjustable position sternum strap is also
included. The belt and shoulder straps have 3D mesh on the underside. This gives them a little bit more cushion, and the belt
also has more texture for better grip.
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
Side compression straps are made from non-stretchy 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
A centrally located Hydration Port is included to string out a
drinking tube over either the left or right shoulder. It is just
above/between the shoulder straps and it has a triangular cover to
keep out water. A water bladder can either be
hung from an internal hang loop, or laid horizontally on top of
The 52L or 60L pack sizes are enough space for 5-6 days of
food and ultralight gear. The pack can be compressed down with the roll top
and side compression 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.
The frame height changes depending on which torso range you
choose. The Short and Medium size frames will fit into an Airplane overhead bin
and can be used as a carryon
when flying. The Tall size frame may not fit unless you pop the
vertical frame bars out of the pack.
All ZPacks gear has a one year warranty against defects in materials or
workmanship. Returns or exchanges are welcome.
The torso height on our backpacks is the actual distance on the backpack
measured from the bottom of the belt to where the shoulder straps attach. Your
best bet for sizing is to find an existing pack that you like and measure it
directly. The torso height on this pack is adjustable up and down within a 4
inch (10 cm) range for a perfect fit. The Medium range is a good bet for the
most people unless you are fairly tall or short. If you are on the line get
The shoulder straps should be positioned level with, or a bit below the tops of
your shoulders. The included Load Lifter straps will pull the shoulder straps up
off your shoulders and will also pull the top of the pack in over your shoulders
to help stabilize it.
The belt size is the length of the belt padding from tip to tip. For example, a medium 30 inch (76 cm)
belt has 30 inches of padding from tip
to tip. The belt can cinch down to the point of the padding just about touching
in front. The belt webbing extends 15 inches (38 cm) beyond the
padding. So for example, a Medium belt would fit a range of 30" to 45".
Use a string or cloth tape measure pulled tight around the spot on your body
that you want the belt to ride. You want at least a few inches of webbing in
front to allow for adjusting the buckle. If you are on the line, size down so
that you have room for adjustment. As an example, if you measure 35 inches, a
medium 30 inch belt would give you 5 inches of webbing to adjust in front but a
large 34 inch belt would barely fit with almost no room for adjustment.
Backpacks are made to order. There is currently a lead time of about 4-5 weeks. If your order needs to arrive by a certain date please let us know after you order and we will schedule accordingly if possible.