REI Co-op Aconcagua

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This top-loading pack for full-on ascents and expeditions is the perfect blend of organization and simplicity.

Front daypack is great for stowing a shovel or remove for summit attempts and day hikes featuring shoulder straps, belt and hydration access
External sleeping-bag compartment with an internal divider for bottom access to your clothes in the main compartment
Fixed suspension, with a molded foam backpanel that sluffs off snow and leaves dirt behind
Slanted water bottle pockets, bottom lash points, daisy chain, dual ice axe loops and side compression straps round out the details
Underneath removable daypack, main pack features a bungee system for lashing on bulky gear
Removable top pocket features a rain guard zipper and had room for the essentials with a zippered slot pocket for smaller, valuable items
Curved, padded shoulder straps feature a sternum strap and load lifters for precise adjusting of various loads
Foam padded waistbelt with stiffener wraps around distributing weight evenly
Molded foam backpanel wraps over the HDPE framesheet and two aluminum stays, all supporting and protecting the back from heavy, bulky loads
Made of lightweight yet tough Dimension Polyant, 420-denier ripstop nylon pack cloth and 600-denier nylon Kodra
Three-layer Dimension Polyant Tenacity Nylon fabric is half the weight of most nylons and better resists water, abrasion and UV-degradation
REI Co-op brand is certified to The Climate Label; we actively fund efforts to reduce carbon emissions across our business and support climate projects around the world

Imported.

Weight	5 lbs. 7 oz. / 5 lbs. 12 oz.
Fits Waist/Hips	30-48 / 32-52 inches
Number of Stays	2
Number of Exterior Pockets	7 + main
Best Use	Backpacking
Fits Torso Length (in.)	17-19 / 19-21 inches
Material(s)	Nylon/polyester
Frame Material	HDPE/Aluminum
Sleeping Bag Compartment	Yes
Sustainability	From a Climate Label Certified brand

How to Choose a Backpack

Types of packs

Backpacking packs can be 30 to 70-plus liters. To choose the right capacity, consider trip duration and the gear you’ll bring.

Backpack features
Think about the frame type, location of important pockets, padding and ventilation, among other things.

Backpack fit
Your pack should be correctly sized for your torso length (not overall height) and hip circumference. A fit-expert at an REI store can help.

Two people hike over a rocky trail carrying backpacks

More expert advice

Image of male backpacker looking into the distance

How to Plan a Backpacking Trip

Two people carrying backpacks walk on a trail

How to Size and Fit a Backpack

How to Pack and Hoist a Backpack

From feedback to field testing, all of our gear is dialed-in by REI Co-op members. Their adventures informed every stitch and detail—making for better, longer-lasting gear.