ZPacks™ Arc Zip Backpack
The Arc Zip has all the same design features as the
, except with
a large Zipper opening on the front of the pack to conveniently
access your gear. It also has a large center pocket made with solid
material and a zipper.
All Arc backpacks have our patented 'Flexed Arc' frame
which 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
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).
Total Volume: 57 Liters / 3,500 cubic inches - 24 ounces
Main Body Volume: About 42 Liters / 2,600 cubic inches
7" x 12.5" x 30" (18 cm x 31.8 cm x 76 cm)
The side pockets account for 5 Liters / 300 cubic inches included in
the total volume.
The center pocket measures 12.5" wide x 2.5" deep x 19" tall (31.8cm
x 6.3 cm x 48 cm), and accounts for about 10 Liters / 600 cubic
inches of the total volume.
Load Carrying Features:
- Please check out this
Video of the Arc Blast Backpack Features. The Arc Zip is the
exact same backpack, except with a zipper opening and zipper
center pocket added.
- Our ultralight 'Flexed Arc' 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:
- The pack body is accessed through a large zipper opening on
the face of the backpack. The zipper is a #5 waterproof zipper.
The top of the pack also has a Roll Top closure (like our
dry bags) which 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
- Two internal horizontal compression straps take stress off of
the zipper entry.
- 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.
- The large center pocket is made with solid material and has a
waterproof zipper opening. It can swallow two ultralight tents, or
other similarly sized gear with room to spare.
- 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 pack size has 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.
- For more info check out the
Backpack FAQs. Make sure to hop down to the bottom of the page
for Reviews and Testimonials
Please watch our
Backpack Fitting Video
with Matt and Will.
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 currently built and shipped in about one week
. If you need your gear by a certain date please email us after you order
and we will schedule accordingly if possible.
There are a handful of lightly used Backpacks in our Bargain
Every option below is detachable and can be added later.
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: $25 each / $45 pair
Shoulder Pouch Details
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: $25 each / $45 per pair
Belt Pouch Details Here
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.
Weight: .43 oz / 12 grams Price: $4.95
Aquaclip 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. 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
Multi-Pack Details Here
This pouch is attached to two stick-on-clips. It is stuck inside the
backpack as a safe place to store your car keys and wallet. If you order
this at the same time as a backpack we stick it on for you towards the top of the pack right
behind the shoulder straps so that it is easy to get to. The
adhesive bonds well with Cuben Fiber and will also work on any
urethane coated backpack material.
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
The pouch itself weighs .6 ounces (17 grams) and the stick-on clips
add about another .1 ounce (3 grams)
Dimensions: 7.5" wide x 5" tall (19 cm x 12.5 cm)
Weight: .6 oz / 17 grams Price:
Key Pouch Details Here
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
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
-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 Price:
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
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 per set of 4 loops. Price: $10
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 as shown on the Green backpack. The included top strap can be used to keep the roll top
snug to the pack.
Roll-top closure straps let you clip the roll top down to the sides of the pack,
rather than simply to itself. You can compress the top of the backpack down
a little easier, but you can do the same thing with the normal roll top just
by rolling it down.
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 in either of the two ways shown to the left.
The straps are detachable, and they can be clipped on to any
older Arc backpack.
Weight: .5 oz / 14 grams Price:
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, but you only get one or the other with the pack depending on if you
upgrade or not. The top strap is removable and you could switch it later.
Weight: .5 oz / 14 grams Price:
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.
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
Weight: 1.0 oz / 28 grams Price:
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 likely fit
non-ZPacks backpacks as well.
Weight: .95 oz / 27 grams Price:
Shoulder Strap Pad Details Here
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:
- The pack belt attachment has two pockets (left and right) and two
loops towards the middle (left and right).
- Slide the bar through the right loop on the pack. Then through the
back of the belt. Then through the left loop on the pack, and into the
left pocket on the pack.
- Make sure the bar is all the way into the left pocket.
- Pull out gently on the center of the belt to flex it until the right
side of the bar pops into the right pocket on the pack.
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.
The Arc Zip is a variation of our popular Arc Blast backpack that was designed
in 2014. We built it because customers asked for it. Most notably,
John Abela of Hikelighter.com
requested the first prototype of this pack and offered some feedback on the
design. Roughly 1/4th of customers choose this style now over the standard Arc
Reviews and Customer Testimonials:
Please email us with feedback (good or bad) if you have any!
"I received my new equipment in time for my trip last weekend. The pack and tent performed well and the trip was a big success. The Arc Zip pack fits really well and was more comfortable than I ever dreamed!" -Merial C.
"I took the Arc Zip pack on a week long 60 mile hike on the Pacific Crest trail west of Whitney in the Sierras.
I have used a dozen packs over the years and none come close to the comfort, ease of access and stability that this pack provides.
I have other ultra light packs and standard packs as well as light daypacks. The Arc Zip has displaced them all." -Ken Bell
Our Flexed Arc Frame is is covered by US Patent No. 9,060,590
"Hey Joe I just wanted to share a few photos with you. My crew
from the PCT 2015 just hiked the Wonderland trail. All three of us using ZPacks backpacks and sleeping bags. They lasted most of the pct and still going. Thanks!" -Ross V.