Sale Ends May 27

REI Co-op  Flash 55 Pack - Men's

Sale Ends May 27
$139.29Compared to $199.00 Save 30%
*Intermediate markdowns may have been taken.
Color: Desert Moss
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Loaded for a week or stripped down for an overnighter, the men's REI Co-op Flash 55 pack keeps your load stable and steady. Its integrated suspension and adjustable torso make any hike comfortable.


  • Lightweight and durable enough for the long haul
  • Adjustable torso offers a fine-tuned fit
  • 3D contoured hipbelt and ventilated back panel are comfortable all day with a load up to 30 lbs.
  • Stronger daisy chain with multiple attachment points allows for tailoring exterior loads
  • Roll-top lid provides weather resistance and allows compression and adjustment of internal volume
  • For a tight load and good balance, Packmod compression straps (included) can be run from any loop to any other loop, so you can sculpt your pack to the shape of your load
  • Included Packmod pockets on the shoulder straps and hipbelt are great for phones, snacks, etc.—or you can take them off altogether to save 7 oz.
  • Compatible with Packmod Hipbelt Extender, Packmod Rainshield Pocket and Packmod Mesh Pocket (not included)
  • Pocket mesh upgraded to more durable and breathable construction
  • Water bottle pockets are positioned forward on the hipbelt so you don't have to remove the pack to grab your drink; snap closures keep a good grip on slim water bottles
  • Internal sleeve holds a hydration reservoir; tube can be routed over either shoulder (reservoir not included)
  • Exterior side pockets are great for storing light items that you want to keep handy
  • Top lid is removable and forms a simple waist pack using the top lid cinch straps; it can also be left at home to reduce weight
  • Large buckled front pocket gives you quick access to things you might need, like a rain shell
  • Attachment loops and removable tool keeper allow trekking poles, ice axes and more to be lashed on, expanding your carrying ability while keeping the load stable
  • Durable water repellent (DWR) helps moisture bead up on the surface
  • Contains materials that meet the bluesign® criteria
  • REI is Climate Neutral Certified; as we work to actively reduce our footprint, we measure annual carbon emissions and purchase an equivalent amount of verified carbon credits


View the REI Co-op Flash Product LineView all REI Co-op Backpacking Packs

Technical Specs

Item #216571
Best Use


Frame Type

Internal Frame

Gear Capacity (L)

S: 53 liters

M: 55 liters

L: 57 liters

L Torso x S Hipbelt: 56 liters

Gear Capacity (cu. in.)

S: 3,234 cubic inches

M: 3,356 cubic inches

L: 3,478 cubic inches

L Torso x S Hipbelt: 3,417 cubic inches


S: 2 lbs. 12 oz.

M: 2 lbs. 13 oz.

L: 2 lbs. 14 oz.

L Torso x S Hipbelt: 2 lbs. 13 oz.

Adjustable Torso Length


Fits Torso Length (in.)

S: 17-19 inches

M: 18-20 inches

L: 19-21 inches

L Torso x S Hipbelt: 19-21 inches

Fits Waist/Hips

S: 32-40 inches

M: 34-42 inches

L: 34-46 inches

L Torso x S Hipbelt: 32-40 inches


Shell A: 100-denier recycled nylon Robic ripstop; shell B: 210-denier recycled nylon Robic (high-tenacity yarns)

Frame Material


Reservoir Compatible


Pack Access


Number of Exterior Pockets

9 + main compartment

Raincover Included


Hipbelt Pockets



S: 14 x 29 x 12 inches

M: 14 x 30 x 12 inches

L: 14 x 31 x 12 inches

L Torso x S Hipbelt: 14 x 31 x 12 inches




Contains materials that meet the bluesign® criteria

From a Climate Neutral Certified brand

46 reviews with an average rating of 4.4 out of 5 stars

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