REI Co-op  Trail 40 Pack - Men's

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This sturdy, big-capacity daypack is also very big on organization and comfort. The REI Trail 40 pack is ready to hit the trailhead and carry everything you need for a long hike.

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Features

  • U-shaped panel with 4 zipper sliders offers quick access to gear and total access when fully open
  • Spring-steel perimeter frame provides load support while also allowing the back panel to conform to your back
  • Included raincover stows in its own zip pocket
  • Padded, mesh-covered straps, belt and back are cool and comfortable
  • Side mesh pocket with elastic closure; outer pocket for phone or sunglasses; sleeve for hydration reservoir (sold separately)
  • Top has a zippered pocket on the underside for your keys and valuables; zippered hipbelt pockets let you access snacks and other essentials as you hike
  • Special fasteners on the back hold trekking-pole tips down low and pole shafts up high
  • Forward-pull hipbelt design makes adjustments quick and easy
  • 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
View all REI Co-op Daypacks

Technical Specs

Best Use

Hiking

Bag Style

Backpack

Frame Type

Internal Frame

Gear Capacity (L)

40

Gear Capacity (cu. in.)

2,441

Weight

2 lbs. 14 oz.

Material(s)

Nylon

Frame Material

Perimeter spring steel

Pack Access

Panel

Number of Exterior Pockets

6 + main compartment

Hipbelt

Yes

Hipbelt Pockets

Yes

Raincover Included

Yes

Reservoir Compatible

Yes

Dimensions

21.625 x 13.125 x 10.5 inches

Gender

Men's

Sustainability

From a Climate Label Certified brand

Buying Advice

REI Co-opREI co-op logo

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.

List of certifications which include The Climate Label certification,
        member informed certification and 100% satisfaction guarantee
Rei Coop brand gifREI Coop brand tent with a user inside wearing a REI Coop brand sweater
List of certifications which include The Climate Label certification,
        member informed certification and 100% satisfaction guarantee

Reviews
141 reviews with an average rating of 4.6 out of 5 stars

Ratings Snapshot

Product Rating

113 out of 122 (93%) reviewers recommend this product

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Average Customer Ratings

Ease of Use

Difficult to useVery easy to use

Overall Fit Rating

Runs SmallRuns Large

Most Helpful Favorable Review

5 reviews with an average rating of 4.0 out of 5 stars
Almost perfect - Still AMAZING for the price!!!
WittyKitty
9 years ago
I got this bag in Red because I love the color and also for visibility. I got several compliments on the look and style of it. This pack is very functional with several little pockets, spots for my trekking poles, jacket outside the top, and sleeping pad on the bottom. The little rings sewn in are convenient for things that need drying. I did a 3 day hiking/camping trip and this bag was great for my gear (hammock system rather than tent). This bag is also VERY comfortable...no sore spots on my waist or shoulders. The reason why I am giving 4 stars rather than 5 is because after the food was gone, I had some space and because there are NO internal nor external compression straps, the gear was weighted down rather than in the middle of my back...though it was irritating, it wasn't enough to make me dislike this bag. I still love it. However with internal and external straps this bag would have been PERFECT!!!.
WittyKitty
NYC
149 people found this review helpful

Most Helpful Critical Review

5 reviews with an average rating of 2.0 out of 5 stars
Just didn't work out
kepPNW
10 years ago
This pack offers some interesting design ideas, but in the end it just didn't work out. The side pockets are really nice, almost to a fault. They're so generous, it's easy to stuff them full enough that they snag (and rip) on brush when bushwhacking. I also liked the large mesh pocket on back. The interior storage was bizarre, though. No potential good came of the truly weird bungie-strapped interior pocket. The bungies were a hassle to deal with in the main compartment, and the pocket they were supposed to cinch down seemed totally useless for day-hiking. The flap pocket was awkward to use, too, and required a lot of attention to zippers when digging through for stuff. Oh, and why was a dedicated pocket, with zipper, added for the rain cover? The full length zippers on the sides seemed like a cool feature, but I honestly never had cause to be thankful for them on the trail, rendering them little more than a nice marketing bullet. The trekking pole attachment thingies were kind of nice when used with poles, but not quite so nice for other things (eg, ice axe). Getting a 3-liter bladder in and out of the exterior pocket was never easy, and the shoulder straps had a web loop on one side but an elastic loop on the other side, which forced me to put my water hose on the "wrong" (elastic) side and move my GPS to the "wrong" (web) side as well. The real deal-breaker though was that this pack hurt. Wearing it for 20 or 25 miles a day proved painful enough, especially given the other design flaws, that I ended up returning it after a dozen or so attempts to make peace with the purchase. For perspective, I'd bought the Trail 40 to replace my (>2000-mile) worn-out Lookout 40, after REI discontinued that line. By some stroke of luck, as I was wrestling with whether to return the Trail 40, an updated Lookout 40 showed up in the REI Outlet! That settled it. Back to (the newer, improved version of) what worked before.
kepPNW
Salmon Creek, WA
21 people found this review helpful

Customer Images

WittyKitty
NYC
Rated 4.0 out of 5 stars

Almost perfect - Still AMAZING for the price!!!

9 years ago

I got this bag in Red because I love the color and also for visibility. I got several compliments on the look and style of it. This pack is very functional with several little pockets, spots for my trekking poles, jacket outside the top, and sleeping pad on the bottom. The little rings sewn in are convenient for things that need drying. I did a 3 day hiking/camping trip and this bag was great for my gear (hammock system rather than tent). This bag is also VERY comfortable...no sore spots on my waist or shoulders. The reason why I am giving 4 stars rather than 5 is because after the food was gone, I had some space and because there are NO internal nor external compression straps, the gear was weighted down rather than in the middle of my back...though it was irritating, it wasn't enough to make me dislike this bag. I still love it. However with internal and external straps this bag would have been PERFECT!!!.

Yes , I recommend this product
Helpful?
Skipper AT '15
Rated 5.0 out of 5 stars

Best Backpack on the Market

10 years ago

This pack is incredible! I am thru-hiking the Appalachian Trail and I needed a new pack about half way through my trip. I got this pack because it was exactly the size I needed for my summer gear setup, and it looked like it was a well thought out design. I couldn't be happier! This pack has already made it 600 miles and still feels as comfortable as ever. Whoever thought of the design with the fully opening main pocket and the brain attached to the main body of the pack is brilliant. I literally cannot think of anything bad to say about this pack. I definitely recommend this pack for both day hikes and anything longer. It is perfect for my thru-hike!

Yes , I recommend this product
Helpful?
mattdel
Anchorage, AK, United States
Rated 5.0 out of 5 stars

Perfect Pack for the money

10 years ago

I recently purchased this backpack from REI in Anchorage AK. After completing a one day 23 mile hike on crow pass trail, I realize that it can't get any better than this. I had 32lbs worth of gear and water and don't have anything bad to say about the fit. It felt just as good as 30lbs can without causing any unusual discomfort. The full zipper proved to be convenient when I needed to get things out of the bottom of the bag and its easy to adjust the weight by tightening and loosing the various points of adjustment. The hiking pole inserts and straps worked flawlessly and came in handy throughout the day. Packing & organizing this bag was a breeze because of the full zipper and the cost is unbelievably cheaper than other major brand names. If your looing for a great day pack that's durable and won't cost you an arm & a leg then look no further. I would recommend this to anyone doing day hikes or light pack camping trips. Make sure you pay attention to the size when ordering online. I was able to get fitted in the store. I'm 6 foot 2 inches and 205lbs and the large fits perfectly, I have a long torso and was having trouble with proper fitting with some other packs. I can honestly say if you pay attention to the torso size you shouldn't have any issues.

Yes , I recommend this product
Helpful?
SnowSaver
Sacramento, CA
Rated 5.0 out of 5 stars

Excellent Day Pack

10 years ago

I recently bought this and used it on three hikes. It was comfortable, relatively cool, and carried everything I needed, including a larger than normal first aid kit, emergency bag, clothing, food, maps, guidebook, etc. I like the upper and lower external accessory straps that allow easy carrying of a coat or pad. Overall, it is excellent. I have one minor concern: It is hard to open the exterior hydration pocket and insert the bladder. Also, the hook does not hold my Camelbak bladders securely. Otherwise, I am extremely pleased with this pack

Yes , I recommend this product
Helpful?
GTinLA
Los Angeles, CA, United States
Rated 5.0 out of 5 stars

Perfect day- and one night overnight pack

7 years ago

Where to begin? This is such a great pack for day hikes, but I also used for overnight trips (one night only, beyond that is really pushing it). I love the outer stretch mesh to quickly get to rain- or windproof items, the side pocket to access your valuables, the 4 different ways you can open the pack and quickly get to anything. (top, left side, right side, full open), the trekking pole system with steel holders for the carbon tips, plenty of room to leash anything on (snow shoes, crampons), the inner compartment system (two integral sleeves) top and bottom compression or open up to carry tent, sleeping bag etc.

Yes , I recommend this product
Helpful?
Pali Aha
HONOLULU, HAWAII
Rated 5.0 out of 5 stars

My Best Carry On for All My Travels

8 years ago

Awesome bag. I got the 40 in black. It passes ALL airlines' CARRY ON guidelines. The front of the pack ZiPPERS open for easy access like an upside down U that runs from the bottom left along the side to the top and then back down to the right. The ZiPPER can be open from the left or from the right. In your hotel room you set the bag down horizontally and you can unzip the front flap open to reveal all the contents of your bag. It's a NO NONSENSE bag. I travelled for 30 days in S.E. Asia w/my clothes, GoPro, and its accessories. I love this bag.

Yes , I recommend this product
Helpful?
PatrickTyler
Boulder, CO
Rated 5.0 out of 5 stars

Great day pack

10 years ago

I use this pack everywhere I go. I take it with me when if I am on a day hike or just a day around town. I can easily fit a rain jacket, backup sweater and shirt incase the weather changes up on me. The upper zipper pocket (outer) is easily accessible and big enough to hold several small items while the zipper pocket on the inside conveniently flops down when you open the main compartment making it a great place to store valuables like a phone or wallet. The included rain cover was a nice surprise and comes in handy all the time.

Yes , I recommend this product
Helpful?
deeno
California, United States
Rated 4.0 out of 5 stars

Almost perfect

9 years ago

This bag is almost perfect the only problems - and they were deal breakers for me: 1) no strapping to squeeze the main compartment down - things will bounce around in there when partially loaded. 2) the hooks that attach the sternum straps to the shoulder straps tend to bind on the fabric (similar to a zipper catching). The one I was looking at the strap was completely stuck, upon closer inspection, it was tearing the thin mesh shoulder strap material. I have a feeling they are all like this so be careful if you try to adjust the sternum strap up/down and it binds. Otherwise this is a super bag and has better features than most without looking so bakackerish when you're using it.

Yes , I recommend this product
Helpful?
Clay R.
Rated 4.0 out of 5 stars

Compression straps would make this perfect

9 years ago

I bought this to consolidate two older packs, one large Camelbak and an older Mountainsmith. It has the capacity of the Mountainsmith and the hydration capability of the Camelbak. I love the 4 zipper access, and it is really comfortable. The one thing that keeps me from giving this 5 stars is that it really needs compression straps. If you don't fill the pack, everything just slides to the bottom. Top and bottom compression straps would let you keep the load close to your back and keep a flat profile.

Helpful?
joninjaman
Portland, OR, United States
Rated 4.0 out of 5 stars

Great One Bag Travel Bag

8 years ago

I bought this in April of 2016. Ive used it in eight countries, most recently for a 6 week trip to SEA. This bag is pretty freaking awesome. Packing 7 tshirts, 4 pairs of a horts, a hoodie, rain jacket, some underwear, toiletries, and socks has been no issue. It will fit in overhead compartments no problem, but if it's fully packed you won't get in under the seat. PROS - The zipper opening is awesome. If you need something at the bottom you don't have to open the whole thing - Comfortable carrying for extended amounts of time - The organization is okay. Not great but works well for me CONS - The biggest gripe for me is this Bag doesn't sit up right. It will fall over if you don't lean it against a wall - Unless you're using the rain fly, this bag isn't waterproof - More compression straps and some more pockets would be great

Yes , I recommend this product
Helpful?
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