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The REI Co-op Men's Flash 45 Pack is a midrange backpacking backpack that comes in two sizes (S, M), while the REI Co-op Men's Flash 55 Pack is a midrange backpacking backpack that comes in three sizes (S, M, L).

See the key differences:

REI Co-op Men's Flash 45 Pack REI Co-op Men's Flash 55 Pack
MSRP $159.00 $199.00
Shop Online $159.00 at REI $199.00 at REI
Best Used For Backpacking Backpacking
Weight S: 2 lbs. 7.5 oz.
M: 2 lbs. 8.5 oz.
S: 2 lbs. 9 oz.
M: 2 lbs. 10 oz.
L: 2 lbs. 11 oz.
Volume S: 43 liters
M: 45 liters
S: 53 liters
M: 55 liters
L: 57 liters
Gender Men's Men's
Fit - Waist S: 30-40 inches, M: 32-42 inches S: 30-40 inches, M: 32-42 inches, L: 34-46 inches
Dimensions S: 14 x 28 x 11 inches, M: 14 x 29 x 11 inches S: 14 x 29 x 12 inches, M: 14 x 30 x 12 inches, L: 14 x 31 x 12 inches
Sizes S, M S, M, L
Colors Pumpkin Asphalt, Olive Oil
Materials Ripstop nylon; nylon Oxford (bluesign® approved) 100-denier ripstop nylon main body; 420-denier nylon bottom
Description Pack what you will for your weekend trip-the men's REI Co-op Flash 45 pack holds your load stable and steady. A contoured hipbelt and ventilated back panel let you hike cool and comfy. 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. Seamlessly integrated suspension makes your hike cool and comfortable.

Weight

See the weight difference between the REI Co-op Men's Flash 45 Pack vs REI Co-op Men's Flash 55 Pack.

The lightest version of the REI Co-op Men's Flash 45 Pack weighs 1.5 ounces less than the lighest version of the REI Co-op Men's Flash 55 Pack.

Price vs. Weight

Compare the price-to-weight ratio of the REI Co-op Men's Flash 45 Pack and REI Co-op Men's Flash 55 Pack to all the other backpacking backpacks in our database.

Volume

The smallest size REI Co-op Men's Flash 45 Pack holds 10 liters less than the smallest size of the REI Co-op Men's Flash 55 Pack.

See how much gear each pack carries:

Price vs. Volume

Compare the price-to-volume ratio of the REI Co-op Men's Flash 45 Pack and REI Co-op Men's Flash 55 Pack to all the other backpacking backpacks in our database.

Load Range

Compare how many pounds of gear each pack can comfortably carry.

Where to Buy

At the time of publishing, the REI Co-op Men's Flash 45 Pack retails for $40 less than the REI Co-op Men's Flash 55 Pack on REI.com.

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Price History

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