REI Co-op Tarn 40 Pack - Kids'

The kids' REI Co-op Tarn 40 pack is designed to help carry the load on overnight adventures, with quick-access storage and a removable top lid. The back panel adjusts to their torso as they grow.

Built for durability with a nylon ripstop body and a double-layered, recycled-nylon bottom, it offers a 40-liter capacity that lets them carry sleep gear and essentials on group trips.

Key Features

Highlights

• Optimized for ages 8 to 12 years
• Back panel and hipbelt can be easily adjusted to fit kids as they grow—or be used by a friend or sibling
• 40-liter capacity lets them carry their sleep gear and essentials on group trips
• Built for durability with a nylon ripstop body and a double-layered, recycled-nylon bottom
• Shell and lining fabrics are made with a durable water repellent (DWR) finish made without PFAS to help moisture bead up on the surface
• Padded shoulder straps and hipbelt provide a comfortable carry; adjustable chest strap cinches and slides to just the right spot
• Hipbelt with zippered stash pockets for quick access to on-trail essentials—like snacks or a phone
• Easy-open buckles throughout are designed for kids' hands
• Large interior with drawcord top holds a sleeping bag plus room to spare
• Internal sleeve holds a hydration reservoir (not included); dual hose exit ports give them options for routing the tube
• Removable and roomy top lid for organization and quick-access storage
• Large front stuff pocket stashes an extra layer—like a rain jacket
• Daisy chains on the front let kids hang gear—or fun accessories, like keychains
• Large, expanding side pockets for water bottles and taller objects; upper compression straps can help secure taller items
• Bottom accessory straps let them carry their own sleeping pad
• 10 Essentials packing list is printed under the top lid for easy access
• Contains bluepass certified material
• 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

Would this backpack fit me if I’m a 115lbs, 5’6.5 with a torso of 17’’ and hips 29’’

The torso range for this pack is 12-16 inches.

What is the max hip circumference

This pack has a waist range of 24-34 inches.

Is this waterproof?

This pack is made of waterproof materials. However, the seams are not sealed and the zippers are not waterproof, so the pack is not considered to be waterproof. Follow the link below for rain cover options: https://www.rei.com/b/rei-co-op/c/pack-rain-covers

Wondering about the vertical height of 24 inches. Is that fully loaded, or empty? Does it squish at all? Hoping to use as a carry on, but plane is limited to 21 inches on the longest dimension.

Most airlines require a piece of carry-on luggage to be no bigger than 45 linear inches (L + W + H) to meet carry-on size restrictions. This can vary so please check with your airline ahead of time.

Is the removable top lid suitable for a summit pack? How is it carried?

The lid is removable. However, it's not designed to be a daypack.

Half of the sternum strap broke off…does rei sell a replacement sternum strap kit, or recommend a certain replacement?

We are sorry, as of August 2025 we do not have a model-specific sternum strap that fits on the piping. We recommend the nearly universal Timbuk2 sternum strap.

I misplaced the fitting instructions, is a copy available online?

Here is our Expert Advice article on fitting packs: https://www.rei.com/learn/expert-advice/backpacks-adjusting-fit.html

How do I find a replacement hip belt kit

Unfortunately, we do not have replacement hipbelts for this pack.

Would this be comfortable for a petite (4'10") adult woman with a 14" torso length?

Yes, we expect this pack would be a comfortable fit for you.

Is there a rain over for this pack?

Yes, our REI Co-op Duck's Back Pack Rain Cover - Small fit packs 35 to 45 liters: https://www.rei.com/product/236018/rei-co-op-ducks-back-pack-rain-cover-small

Better gear is built together. 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.

Contains bluepass certified material. Contains recycled materials. From a Climate Label Certified brand.