GearSift
Head-to-Head Backpacks

Osprey Exos 58L vs REI Co-op Flash 55L

Capacity vs Value: Which Backpack Wins?

6 min read
Specs last verified 2026-04-08. Prices and availability may change.

When comparing the Osprey Exos 58L and REI Co-op Flash 55L, the Osprey Exos 58L emerges as a better choice for those prioritizing capacity and load-carrying ability. However, the REI Co-op Flash 55L offers superior value for its price point.

The Numbers

Side-by-Side

SpecExos 58LFlash 55LDelta
Capacity
Hipbelt Pockets
Max Load30 lbs
Weight

Where Osprey Exos 58L Wins

The Osprey Exos 58L boasts a larger capacity of 58 liters, giving you more room for gear and supplies on extended trips. This extra space can be crucial when every ounce counts, allowing you to pack just enough without compromising comfort or performance. Additionally, the Osprey model supports a heavier load at up to 35 pounds compared to the REI’s 30 pounds, making it ideal for those who need to carry more weight over longer distances.

Where REI Co-op Flash 55L Wins

The REI Co-op Flash 55L shines in terms of value, offering more liters per dollar than its competitor. This makes it an excellent choice for budget-conscious hikers looking to maximize their gear without breaking the bank. The negligible difference in weight and hipbelt pockets means both models offer similar comfort and convenience features.

When to Buy Which

Osprey Exos 58l: 2 wins | Rei Co Op Flash 55l: 1 win | 1 tie

Buy Exos 58l if...

  • You prioritize capacity
  • You prioritize max load

Buy Flash 55l if...

  • You prioritize weight

The Verdict

If you prioritize carrying capacity and load-carrying ability, the Osprey Exos 58L is your best bet. However, if budget is a primary concern and you’re looking for the most value per dollar spent on gear, then the REI Co-op Flash 55L should be your go-to choice.

Exos 58L

Exos 58L

$285

View Specs & Prices
Flash 55L

Flash 55L

$229

View Specs & Prices

FAQ

Which backpack has more capacity?

The Osprey Exos 58L offers a larger capacity of 58 liters compared to the REI Co-op Flash 55L’s 55 liters.

What is the weight difference between these two models?

Both backpacks weigh nearly the same, with the Osprey Exos being just slightly heavier at 45.4 oz versus the REI Co-op Flash’s 45 oz.

Which one offers better value for money?

The REI Co-op Flash 55L provides superior value, offering more liters per dollar compared to its competitor.

Related Guides