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Handy in town, on trails and for short hikes away from basecamp, this little pack cleverly converts into a stuff sack when you turn it inside out.

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Features

  • Lightly padded stretch-mesh shoulder straps enhance comfort
  • Removable back panel pad doubles as a sit pad
  • Hipbelt and sternum strap can also be detached
  • Sternum-strap buckle doubles as a safety whistle
  • Hydration-compatible design includes a hose exit port and an internal sleeve for a reservoir (sold separately)
  • Drawcord closure fully covers the top opening when cinched tight
  • Pack has an inner zip pocket and 2 daisy chains outside
  • 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

Frame Type

Frameless

Ultralight

Yes

Gear Capacity (L)

18 liters

Gear Capacity (cu. in.)

1,100 cubic inches

Weight

12 ounces

Fits Torso Length (in.)

17 - 19 inches

Fits Waist/Hips

26 - 42 inches

Material(s)

Ripstop nylon

Suspended Mesh Back Panel

No

Pack Access

Top

Number of Exterior Pockets

1 + main compartment

Dimensions

16 x 9.5 x 8 inches

Gender

Unisex

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
7 reviews with an average rating of 4.0 out of 5 stars

83% 5 of 6 reviewers recommended

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Water Ouzel
Location:Portland, OR
Rated 5.0 out of 5 stars
10 years ago

Love this pack!

I picked up this pack for a 3-week trip to Ecuador and the Galapagos. I was pretty skeptical of the pack because it seemed kind of flimsy, but I knew I'd only need it to carry a few light weight items (sunscreen, hat, water, camera, rain coat) while doing day hikes. It rolls up pretty small so I figured I would just stash it in my bigger back pack and use this one on day trips. I absolutely love this pack! It's light weight, it's comfortable, you can squish a lot of stuff in there, and it's set up to carry a water bladder. It's also got a zippered pocket on the inside to stash lip balm, cell phone, keys, etc., so you don't have to go fishing around in the main part of the pack. And, if you turn it inside out, you can use it as a stuff sack or a pillow if you put some soft items in there. I have a small Black Diamond day pack I have used for years for day hikes and skiing, but I will be retiring that pack and using this one because this pack is so awesome!

mountaincat
Location:Pleasanton, CA, United States
Rated 5.0 out of 5 stars
11 years ago

great pack for those short walks

I love this pack! My hydration bladder fits perfectly and those few little items I need for my daily walk with my dog are right at hand. Closes easily and with one hand. No annoying zippers to deal with. This will be my go-to pack for any short hike. And love that it comes in so many colors. I may have to get another....

emp9
Location:Lakewood, CO, United States
Rated 5.0 out of 5 stars
11 years ago

Summit Sack

I own 2 versions of this pack. Great pack! However, has anyone thought about increasing the opening diameter 1 more inch? Some of us carry bear canisters and the Flash is almost able to go over a canister. The daisy chaining on the outside(or inside) of the pack would make it possible to strap a empty canister on the outside of my backpack.

vwvanagon
Location:Redlands, CA, United States
Rated 2.0 out of 5 stars
10 years ago

weak shoulder strap design

Brought it for a two week trip, using it as a day pack. Mostly carrying a bottle of water, small camera and some snacks. The lower shoulder webbing strap start to tear out from the weak mesh/foam part, it definitely not a defect but design problem. One of my coworker have an older version of flash 18 and it was constructed better than the new design. I would not recommend this pack unless you are planning to carry very light items

My2Cents
Rated 2.0 out of 5 stars
10 years ago

REI Flash 18 Pack

Just received this in the mail today, and it is a medium to dark grey instead of the light grey "titanium" color that was pictured in the photo. It is going back to REI ASAP. On a tangential note, it looks like REI started sewing the inside pocket so that it lays firm against the pack and added a hard plastic cover where the draw cord attaches, thereby making it slightly less minimalistic than previous versions. Maybe the new whistle feature (integrated into the chest strap buckle) is useful though--assuming you don't already have one.

ghostfire
Location:Seeley, CA, United States
Rated 4.0 out of 5 stars
10 years ago

good little day pack

I bought this to carry my dog in for a 5k because she won't run on her own. It did a great job she was comfortable the whole time and she got to spend time out of the house. It has very few pockets all interior, but plenty of space. The straps could have more padding for heavier loads but still a comfy pack.

DonaldKShin
Location:Gardena, CA
Rated 5.0 out of 5 stars
10 years ago

Loving it! Best buy product!

Been using this pack for day hikes and on snowboarding trips, and am very happy with it. It's a very straightforward simple pack that does what I need it to do: it holds a reservoir (I think 2L is best fit), packs a few extra light layers for those who don't know how to layer properly to begin with (me), and has a small zippered pocket on the inside to hold a few key things like my phone, ID, medkit, or keys. The daisy chain on the exterior is nice as well to clip on a few light items. Straps, hip belt and chest strap actually pretty comfortable and have no complaints. I am not sure how well it will hold with heavier loads (though we should all learn to not take too much along on a short day hike anyway). I think over time the light nylon fabric will wear and tear quite easily, but have definitely already used my money's worth out of this pack over the past month and is still in great condition. Definitely worth the great price! Especially if you are a light packer.

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