The most common question we get is some version of "will this work with my pack?". For almost everyone, the answer is yes, and the reason is a number worth knowing.
The number that matters: 0.292 inches
Hydration tubing is one of the quietly standardized parts of the outdoor industry. The common inside diameter is 0.292 inches, or 7.41 mm, and the major brands build to it.
That is the diameter our Ever Sip™ is built to, which is why it works as a straight replacement on most hydration packs rather than requiring you to replace the whole system.
The differences between brands are not usually the tubing. They are the connector at the reservoir end.
The three versions we build
Standard
Covers the majority of hydration packs, including CamelBak® systems and most reservoirs using a conventional push-on tube connection. If you are unsure and your pack is not specifically HydraPak or Osprey, this is almost certainly the one.
HydraPak®
HydraPak uses its own quick-disconnect arrangement. We build a version to match, so you keep the disconnect behavior you already have.
Osprey Hydraulics™
Osprey's Hydraulics reservoirs use their own connector design. Same principle: we build to it so the swap is direct.
How to identify what you have
The fastest check is the reservoir end of your existing tube:
- Push-on, no obvious release button: standard.
- Quick-disconnect with a visible release: check the reservoir branding. HydraPak and Osprey both use their own.
- Branded Osprey with "Hydraulics" on the reservoir: Osprey Hydraulics version.
If it is not obvious, the reservoir itself is usually printed with the brand. When in doubt, send us a photo and we will tell you which one you need.
What about the bite valve?
Our tube comes as a complete assembly including the bite valve cover, because that is where freezing starts and a heated tube that stops short of the valve would leave the actual failure point uncovered.
What about bladder volume?
Irrelevant to fit. A 1.5L, 2L or 3L reservoir uses the same tubing. Volume affects how long your water lasts, not whether the tube connects.
Things that will not fit
Being straight about the limits:
- Systems using non-standard tube diameters, which are rare but exist on some specialist and older packs.
- Integrated systems where the tube is permanently bonded to the reservoir and cannot be removed.
- Bottle-based setups with no tube at all.
If you are in any of those categories, ask us first rather than ordering hopefully.
What you are actually changing
This is the part people find reassuring: you are replacing one component. Your pack stays, your reservoir stays, your fit stays. The only addition is a USB cable routed to a power bank in your pack.
That was deliberate. Winter-proofing your hydration should not mean replacing gear that already works.
Specifications
- Inside diameter: 0.292 in / 7.41 mm (standard)
- Power: 5V, 1 to 3A (5W to 15W)
- Minimum operating temperature: −1°F / −18.3°C
- Sleeve options: nylon sheathing or neoprene
- Cable options: USB-A or USB-C
- Warranty: 12 months against manufacturing defects
Built by hand in Colorado's Front Range and tested on Colorado's mountains through the winter, with Breckenridge as our home hill.
Choose your configuration, or check the FAQs.
