#2 in Hydration Reservoirs
Ranked #6 of 8 in Hydration Reservoirs
CamelBak Crux 3L
The bladder most hikers already know: cheap, easy to find spare parts for, and fast to drink from, with a screw cap that is the one real annoyance.
4.6 · 9,243 Amazon ratings
Prices change daily, so we link to the listing instead of printing one.
- Capacity
- 3 L (100 fl oz)
- Weight
- 235 g (8 oz)
- Dimensions
- 46 x 23 x 8 cm (18 x 9 x 3 in)
The verdict
Is the CamelBak Crux 3L worth it?
Yes, if you want a cheap, proven three-liter bladder or a replacement for the one your pack came with. The Crux has a shutoff lever at the bag, a self-sealing bite valve and a big screw cap with a handle. It does not open wide or turn inside out, so it is harder to dry and clean.
That is why it sits sixth of eight in our hydration reservoir ranking rather than near the top. On the things you notice while hiking, it does fine: water comes through the Big Bite valve quickly, and the lever lets you shut the tube off at the bag so a valve knocked open in the car does not drain into your pack.
Where it loses ground is at home. A screw cap leaves only a small opening, so getting a brush and a towel inside takes more work than a slide-top bag. For a first bladder, a spare, or anyone who mostly wants the lowest cost per liter, those trade-offs are easy to live with.
Buy it if
Skip it if
Specs
CamelBak Crux 3L specs
From CamelBak's published specs.
What's good
What to know
Will the Crux 3L fit my backpack as a replacement bladder?
In most packs with a hydration sleeve, yes. At about 46 cm tall it suits a full-size daypack or a backpacking pack. In a small daypack the sleeve may be shorter than a full three-liter bag, so it bulges or folds over. Measure the sleeve before ordering, and pick the 2L Crux if it comes up short.
If your pack uses its own hanger system, such as Osprey's HydraClip, the Crux still sits in the sleeve but will not clip into it, so it can slump a little as it empties.
How do you keep water cold in a CamelBak bladder?
Start cold. Fill it with cold water and a handful of ice, which the wide screw cap makes easy. Slide it into the sleeve against your back, inside the pack and away from the sun. After each drink, blow the water in the tube back into the bag, since the tube warms up first, and clip the valve to your sternum strap where your body shades it.
If you hike in real heat or below freezing every week, an insulated bag such as the CamelBak Stoaway will hold temperature longer than any trick with an uninsulated one.
How do you clean a CamelBak Crux?
Rinse it after every hike and dry it fully with the cap off, propped open so air can get in. Every few weeks, scrub it with warm soapy water and a reservoir brush, and run a tube brush through the hose. Cleaning tablets help with taste. Mold almost always starts in a bag that was stored still damp.
Alternatives
What to buy instead of the CamelBak Crux 3L
Questions
CamelBak Crux 3L FAQ
Is the CamelBak Crux 3L BPA free?
Yes. CamelBak lists the Crux as free of BPA, BPS and BPF, and the bag and tube carry its HydroGuard treatment, which is meant to slow bacteria growth between cleanings.
How much does a CamelBak Crux 3L weigh?
About 235 g, or 8 oz, empty. Full, three liters of water adds about 6.6 lb, which is why it matters that the bag sits close to your back in a proper sleeve.
Can you replace the bite valve or tube on a Crux?
Yes. CamelBak sells replacement Big Bite valves and tubes, and they are stocked by many outdoor stores. Since the valve is usually the first part to wear, replacing it is cheaper than buying a new bladder.
Is the Crux 3L too big for a day hike?
Not if your pack holds it. Three liters covers a long summer day for most hikers, and you can fill it partway on shorter outings. In a pack under about 20 liters, the 2L size usually fits the sleeve better.
Words on this page
Sources
By Tom. Written from published specs, Amazon buyer reviews and AI-assisted research. We have not tested every product ourselves. Updated October 15, 2026.
Decided?
CamelBak Crux 3L