The opening decides whether it dries; the liters only decide weight · review
Two complete reservoirs for sixteen dollars, with the widest fill port stated on this shelf at four inches — on a page whose wording appears under two other brands in this same group.
Two 2 liter reservoirs, blue and army green, with a gaiter.
Baen Sendi states a package of two bladders with a multifunctional neck gaiter as a free gift; thick premium quality flexible material and a passed pneumatic pressure test; a quick-release auto-lock system preventing leaks when the tube is detached and allowing the tube off for filling, cleaning and storage; a high-flow bite valve with an accessible on/off valve, a dust cover and flow controlled by biting; and a large opening with a 4 inch screw-on cap wide enough for a hand or a bottle brush, taking ice cubes directly.
No bore. No film named. No seam method. No cleaning method. No weight.
And the sibling listing says three and a half.
Seventeen reservoirs sit on this shelf. Two publish a port width, and both are in this group, from different brands, inside the same sentence.
A wide screw cap fills quickly and admits a hand. It does not let the reservoir be turned back on itself and hung flat, which is what this shelf’s buying tip asks about.
Filling, cleaning and storage.
The auto-lock holds water when the tube comes away, so the reservoir can be lifted out and refilled without threading the hose back through a pack.
This shelf’s introduction lists exactly those three as what a quick-disconnect should buy. This page claims all three.
And the figures inside them differ.
Three listings in this group share the wording about the big opening, the ice cubes from a scoop, and the auto-shutting quick release.
This page gives a 4 inch cap; one sibling gives 3.5 in. Both siblings publish a 0.4 in hose bore; this page does not.
Shared wording, unshared figures. Read the numbers, not the prose.
The American Amazon store was listing it at about $16 at the time of writing.
Every figure here is what Keepa held on the day this page was last revised. Offers and prices shift without warning.
Prices quoted in this text were read on October 8, 2026. The live price is at the top of the page.
| Capacity | 2 L each, stated as 70 oz, with two reservoirs supplied — one blue and one army green. The title also lists 1.5 L, 2.5 L and 3 L as available sizes without saying which is in the box; the bullets describe the 2 L pair |
|---|---|
| Opening type | A screw-on cap, stated to go on and off easily, with a large opening for pouring and for admitting a hand or a bottle brush. This shelf's introduction notes that a screw cap cannot be turned back on itself and hung flat |
| Fill port width | 4 in — stated for the screw-on cap. It is the widest fill port published on this shelf; the sibling listing in this group that shares this page’s wording states 3.5 in |
| Hose internal diameter | Not published — although the two listings in this group that share this page’s wording both publish 0.4 in. The template was edited here and the bore was dropped |
| Bite valve | A high-flow bite valve — stated, with a soft mouthpiece drunk from by biting and a cover to keep dirt out. Flow is controlled by biting, and water is stated not to leak when the valve is not bitten |
| Shut-off | An on/off valve on the mouthpiece — stated as easily accessible and as preventing leakage, with the instruction to turn the outlet valve on before biting |
| Quick-disconnect fitting | A quick-release tube with an auto-lock system — stated to prevent leaking when the tube is detached and to allow the tube to come off for filling, cleaning and storage. That is the full set of three things this shelf's introduction says a disconnect should buy you |
| Film material | Not named — the listing states thick premium quality flexible material and a passed pneumatic pressure test. No polyurethane, TPU or EVA, and no wall thickness |
| Seam construction | Not published for this listing, where the sibling pages sharing its wording state a double sealing side technique |
| Stated cleaning method | Not published as a method. The large opening is stated to admit a hand or a bottle brush; no dishwasher claim and no reversibility |
| Empty weight | Not published |
| Amazon reference | B07BJZK8P5 |
| EAN | 0601913459215 |
Two, and the bullets say 2 liters each — one blue, one army green, with a neck gaiter thrown in. The title complicates it by listing 1.5 L, 2.5 L and 3 L as well, without saying which of them is in the box, so confirm the size on the order page before buying. Two complete reservoirs with hoses and valves for sixteen dollars is the lowest price per reservoir on this shelf by a wide margin, and a second bladder is genuinely useful: one in the pack, one filled in the fridge, or one for each of two people.
For filling and for getting a hand in, yes, and it is the widest port stated on this shelf — half an inch wider than the sibling listing in this group that otherwise shares this page’s wording. What a wide screw cap does not solve is drying, and that is what this shelf's buying tip asks you to think about first: the reservoir does not reverse or turn inside out, so after a wide-mouth rinse it still has to dry as a bag with one hole in it. Budget for a brush and a drying frame, or hang it open over a warm radiator and give it a day.
Because three listings in this group, under three different brands, carry the same sentences word for word — the big opening that makes for easy pouring of water and is fairly wide for a hand or bottle brush, the ice cubes added directly from a scoop or a refrigerator ice dispenser, and the quick-release tube that auto-shuts so the bladder stays filled. The template has been edited unevenly: this page gives a 4 inch cap, one sibling gives 3.5 in, and the two siblings publish a 0.4 in hose bore that this page drops. So the wording is shared, and the figures inside it are not reliably the same product.
Close prices, same category: comparable camping gear. We keep only the specifications all of them publish, because a column with gaps compares nothing.
| Model | Price | Capacity | Opening type | Fill port width | Hose internal diameter |
|---|---|---|---|---|---|
| Baen Sendi 201801 | $16 | 2 L each, stated as 70 oz, with two reservoirs supplied — one blue and one army green. The title also lists 1.5 L, 2.5 L and 3 L as available sizes without saying which is in the box; the bullets describe the 2 L pair | A screw-on cap, stated to go on and off easily, with a large opening for pouring and for admitting a hand or a bottle brush. This shelf's introduction notes that a screw cap cannot be turned back on itself and hung flat | 4 in — stated for the screw-on cap. It is the widest fill port published on this shelf; the sibling listing in this group that shares this page’s wording states 3.5 in | Not published — although the two listings in this group that share this page’s wording both publish 0.4 in. The template was edited here and the bore was dropped |
| CHERAINTI HB-OOA1 | $12 | 2 L — stated, with external dimensions of 14.2 × 6.8 in. The listing states the reservoir is compatible with almost any hydration pack | A screw-on cap, stated to go on and off easily and to be wide enough for a hand or a bottle brush. This shelf's introduction divides openings into those that can be turned back and dried and those that cannot; a screw cap is the second kind, and this listing does not claim the reservoir reverses | Not published as a figure. The opening is described as large and as fairly wide for a hand or a bottle brush, and no diameter is given — where two other listings in this group, which share this one’s wording, publish 4 in and 3.5 in | 0.4 in — stated, with a hose length of 40 in. It is one of only two bore figures published on this shelf, and not one of the nine European listings here publishes any |
| HEIKLN CXHEBLADDERWH | $9 | 2 L — stated in the bullets, with external dimensions of 14.2 × 6.8 in and compatibility with most hydration packs. The title also lists 1.5 L, 2.5 L and 3 L without saying which is in the box; the fifth bullet says one white bladder is supplied | A screw-on cap, stated to go on and off easily, with a wide opening large enough for a hand or a bottle brush. A screw cap cannot be turned back on itself and hung flat, as this shelf's introduction sets out | 3.5 in — stated for the screw-on cap. One of only two port widths published on this shelf; the sibling listing in this group that shares this page’s wording states 4 in | 0.4 in — stated, with a hose length of 40 in. One of only two bore figures on this shelf, and no European listing here publishes any |
| CamelBak Crux 2L | $30 | 2 L — stated, and given also as 70 oz. The smaller of the two Crux reservoirs in this group, at ten dollars less than the 3 L | A leak-resistant cap, stated to be easier to open and close and to reduce leaks during filling and transport. The type is not named beyond cap, and no reversibility is claimed | Not published as a figure, but an ergonomic fill handle is stated — designed for easier lifting and refilling at water sources or sinks. The 3 L listing in this group does not mention one | Not published, on a listing whose first bullet is a high-flow claim |
Two people, or a spare kept filled in a fridge, where price per reservoir is the whole decision
Amazon reports what buyers took in the month before this page was last checked: at least 1,000.
The figure is a floor, rounded by Amazon, and read through Keepa — it says what buyers picked, not what a maker claims.
Specifications: the manufacturer sheet for camping and hiking gear and the matching Amazon product page. Prices and availability: Keepa. Every figure on this page names its source.
2 L reservoir · large opening, type not named · hose supplied · almost nothing else published
A 2 liter reservoir sold with a hose, whose listing publishes the capacity and then almost nothing else — no opening type, no film, no valve, no fittings and no weight.
Best for: A replacement reservoir where the pack sleeve is the only constraint and the details are worked out on arrival.
3 L reservoir · two hoses, summer and winter · cleaning brush included · opening type not named
A 3 liter reservoir that ships with two drinking hoses and a cleaning brush — three items other listings sell separately — while naming neither the opening, nor the film, nor the valve.
Best for: Someone who wants the brush and the winter hose in the same box and will find out about the opening on arrival.
2 L / 70 oz · leak-resistant cap · ergonomic fill handle · one-handed on/off lever on the tube · self-sealing bite valve · high flow, unquantified · no bore, no film named, no weight
The same two shut-offs and the same cap as the three-liter Crux, with an ergonomic fill handle the larger one does not list — and the flow claim left without the number the 3 L gives it.
Best for: A day walk or a ride where two liters is enough and the reservoir has to be lifted and filled one-handed
≈ $30
