Hiking Backpacks / 2 Liter reservoir
Collection

2L Hiking Backpacks

Catalog updated 2026-10-07

The standard size for most day-hiking hydration systems 127 bags · 69 brands

For hiking For traveling For men Daypacks For camping For women Waterproof Ultralight Foldable & Packable For cycling Affordable Black Hydration bladders 20 Liter capacity Military & Tactical 40 Liter capacity Blue Sling bags Crossbody For climbing 30 Liter capacity 2 Liter reservoir For running 25 Liter capacity Green 10 Liter capacity 15 Liter capacity 35 Liter capacity 3 Liter reservoir Shoulder For hunting 50 Liter capacity Grey Reflective Gray Fanny packs Unisex 60 Liter capacity 1.5 Liter reservoir 70 Liter capacity Orange Insulated Purple Red Anti-theft Navy Army Green 2.5 Liter reservoir Nylon Canvas Khaki Brown Olive Tan

Best 2L Hiking Backpacks

# Brand Model Facts Tier Weight See deal
1 CamelBak Crux 2L hydration reservoir blue CamelBak Crux 2L hydration reservoir blue Blue · For hiking · For cycling $29.99 1.98 kg
$29.99 See deal
2 Mardingtop Black tactical daypack with molle webbing Mardingtop Black tactical daypack with molle webbing Black · For hiking · Daypacks $37.99 0.85 kg
$37.99 See deal
3 Maelstrom ultralight hiking pack 20l Maelstrom ultralight hiking pack 20l For hiking · Ultralight · Hydration bladders $31.34 —
$31.34 See deal
4 Osprey Blue hydraulics 2l water reservoir Osprey Blue hydraulics 2l water reservoir Hydration bladders $50 0.21 kg
$50 See deal
5 The Outdoor Recreation Outdoor Products 2L hydration reservoir bladder 8.9 The Outdoor Recreation Outdoor Products 2L hydration reservoir bladder Affordable · Hydration bladders $12.77 —
$12.77 See deal
6 Deuter Speed Lite 21L Hiking Daypack in Black Deuter Speed Lite 21L Hiking Daypack in Black Black · For hiking · Daypacks $79.95 —
$79.95 See deal
7 HydraPak Seeker collapsible camping water storage 2L mammoth grey HydraPak Seeker collapsible camping water storage 2L mammoth grey Gray · For camping · Grey $27 —
$27 See deal
8 WATERFLY Hiking backpack 20L water resistant WATERFLY Hiking backpack 20L water resistant For hiking · Daypacks · Hydration bladders $37.99 0.62 kg
$37.99 See deal
9 CHERAINTI Military green 2L hydration bladder 9.1 CHERAINTI Military green 2L hydration bladder Green · For hiking · For camping $9.99 0.28 kg
$9.99 See deal
10 Platypus Taste-free 2 liter hoser water bladder Platypus Taste-free 2 liter hoser water bladder For hiking · Ultralight · Hydration bladders $34 0.1 kg
$34 See deal
Nearby sets
Hydration bladders For hiking For cycling For running For camping Affordable 3 Liter reservoir 1.5 Liter reservoir

What a 2L reservoir pack is

A 2L hiking backpack is a hydration pack built around a two-liter bladder sleeve, usually with a hose port over the shoulder. The reservoir sits flat against the back panel, and the pack carries little else beyond a shell, snacks, and a phone. These packs show up in black, gray, green, and blue.

How it differs from other reservoir sizes

A 2L reservoir holds less than a 2.5L or 3L bladder, so the pack stays flatter and lighter against the spine. It holds more than a 1.5L setup, which suits shorter outings where refill points are close. The trade is capacity for water versus capacity for gear.

Sizes and details that show up

Pack bodies in this group run small: 5L, 6L, 20L, 21L, and 25L volumes appear alongside the 2L bladder. A 20L or 21L daypack leaves room for a layer and lunch on top of the reservoir. Smaller 5L and 6L vests carry the bladder and almost nothing else.

Materials lean toward lightweight nylon or polyester with water-resistant coatings. Some packs use molle webbing for attaching small pouches, and others use a simple stretch pocket. Shoulder straps are padded and often include a sternum strap to keep the load steady.

When a 2L reservoir is the right call

A 2L bladder covers a few hours of moderate hiking in mild weather. It fits day hikes where you pass a water source or carry a filter. For full-day exposed routes or cold-weather trips where water demand rises, a larger reservoir or a bottle-based pack works better.

Before you buy

2L reservoir questions

How long does a 2L reservoir last on a hike?

It covers roughly two to three hours of moderate effort in mild conditions. Hot weather, steep terrain, or a heavy pack will drain it faster. Carry a filter or plan refills if you expect to be out longer.

Can I fit a 2L bladder in a 20L daypack?

Yes, most 20L and 21L daypacks have a dedicated reservoir sleeve that fits a 2L bladder. The sleeve keeps the bladder upright and the hose routes through a port at the top. Check that the sleeve depth matches the bladder height before loading.

Is a 2L reservoir pack heavy when full?

Two liters of water weighs about two kilograms, or roughly four and a half pounds. That weight sits close to your back, so it carries better than bottles in side pockets. The pack itself stays light because the body is small.

What pack volume pairs best with a 2L reservoir?

A 20L to 25L pack gives room for a layer, food, and small essentials on top of the bladder. Vests at 5L or 6L carry the reservoir and a phone but little else. Pick the volume based on how much gear you need beyond water.