The opening decides whether it dries; the liters only decide weight · review
The only American listing on this shelf to publish an empty weight — 0.52 pounds — with its dimensions beside it, a rigid backer plate and a magnetic bite valve.
A 3 liter Hydraulics reservoir with a Slide-Seal top.
Osprey states a leakproof Slide-Seal opening with a one-handed top closure that opens wide for filling and cleaning and seals securely on the move; a lightweight rigid internal backer plate that adds structure so the reservoir slides into a pack and stays upright; a slim slosh-free profile from a central baffle; a high-flow bite valve with an on/off switch and magnetic attachment; a BPA-free pack-compatible design working with most hydration-compatible Osprey packs and the HydraClip hanger system; and item dimensions of 17.3 × 7.5 × 0.4 in with an item weight of 0.52 lb.
No bore. No film named. No disconnect. No cleaning method.
Nought point five two pounds, with the dimensions beside it.
Sixteen of the seventeen listings here leave you weighing a parcel. One European reservoir states 130 g (4.6 oz); this states 0.52 lb, about 236 g (8.3 oz).
Seventeen point three inches by seven point five by nought point four. That is a figure you can hold against the sleeve in your own pack.
This shelf’s introduction ends on exactly that: whether the hanger and the shape match the pack you own.
Two answers to the same problem.
A full three-liter bladder with no structure folds, sags to the bottom of a sleeve and has to be wrestled back in.
The rigid backer plate keeps it flat and upright. The central baffle holds the water across the width instead of letting it surge end to end.
That is why the profile stays slim when full, and why it loads more easily than three liters suggests.
Which the dimensions make survivable.
The claim is for most hydration-compatible Osprey packs and the HydraClip system. The HydraPak Contour in this group claims a universal hanger for clips, hooks and loops from several brands.
Here the height and width are published instead, so the question can be answered with a tape measure rather than a promise.
The American Amazon store was listing it at about $52 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 | 3 L — stated, described as extra large, with item dimensions of 17.3 × 7.5 × 0.4 in. The 0.4 in depth is the flat figure, so the dimensions describe the reservoir empty |
|---|---|
| Opening type | A leakproof Slide-Seal opening with a one-handed top closure — stated to open wide for filling and cleaning and to seal securely on the move. It is the opening type this shelf's introduction prefers, because it can be turned back |
| Fill port width | Not published as a figure, but the Slide-Seal is a full-width opening stated to open wide for filling and cleaning, and the reservoir is 7.5 in across |
| Hose internal diameter | Not published. A high-flow bite valve and hose are stated with no bore figure |
| Bite valve | A high-flow bite valve with magnetic attachment — stated, so the mouthpiece clips to a sternum strap and returns to the same place. One of two magnetic hose fittings in this group |
| Shut-off | An on/off switch on the bite valve — stated, and described in the maker’s text as thumb-operated |
| Quick-disconnect fitting | Not published as a detachable connector. The HydraClip hanger system is stated for quick integration with the pack, which is a hanging fitting rather than a hose disconnect |
| Film material | Not named. BPA-free is stated and no polymer or thickness appears |
| Seam construction | Not published as a method. A lightweight rigid internal backer plate and a central baffle are stated — the backer plate to add structure so the reservoir slides into a pack and stays upright, the baffle to reduce slosh and keep the profile slim |
| Stated cleaning method | Not published as a method, although the Slide-Seal opening is stated to open wide for cleaning as well as filling. No brush, no reversibility and no dishwasher claim |
| Empty weight | 0.52 lb — stated, about 236 g (8.3 oz). It is the only empty weight published by an American listing on this shelf; on the European side one reservoir states 130 g (4.6 oz) |
| Amazon reference | B0BLZ9GYR5 |
| EAN | 0843820160857 |
Because it is the only part of a reservoir you carry whether it is full or not, and because it is almost never published. This is the one American listing on this shelf to give a figure — 0.52 lb, about 236 g (8.3 oz) — and it gives the dimensions beside it, 17.3 by 7.5 by 0.4 inches. Those two facts together let you check the reservoir against the sleeve in your pack before ordering, which this shelf's introduction ends on as the dull detail that decides daily use. Sixteen of the seventeen listings here leave you weighing a parcel instead.
It stops the reservoir behaving like a bag. A full three-liter bladder with no structure folds, sags to the bottom of a pack sleeve and has to be wrestled back in; a lightweight rigid internal plate keeps it flat and upright so it slides in and stays there. The central baffle does the other half, holding the water across the width instead of letting it surge end to end. Together they are the reason this reservoir keeps a slim profile when full, and the reason it is easier to load than its capacity suggests.
The listing does not promise that. It states the reservoir works with most hydration-compatible Osprey packs and with the HydraClip hanger system, which is Osprey’s own fitting — where the HydraPak Contour in this group claims a universal hanger designed for clips, hooks and loops from a variety of brands. What makes this answerable anyway is the dimensions: 17.3 inches tall and 7.5 wide is a figure you can hold against your own sleeve, and almost nothing else on this shelf publishes one. Check the hanger, then check the height.
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 |
|---|---|---|---|---|---|
| Osprey Hydraulics 3L | $52 | 3 L — stated, described as extra large, with item dimensions of 17.3 × 7.5 × 0.4 in. The 0.4 in depth is the flat figure, so the dimensions describe the reservoir empty | A leakproof Slide-Seal opening with a one-handed top closure — stated to open wide for filling and cleaning and to seal securely on the move. It is the opening type this shelf's introduction prefers, because it can be turned back | Not published as a figure, but the Slide-Seal is a full-width opening stated to open wide for filling and cleaning, and the reservoir is 7.5 in across | Not published. A high-flow bite valve and hose are stated with no bore figure |
| HydraPak Force 3L | $46 | 3 L — stated. The larger of the two HydraPak reservoirs in this group, and the most expensive listing on this shelf | A wide Slide-Seal top — stated to make filling easy, with the reservoir fully reversible. It is the opening type this shelf's introduction prefers, because it can be turned back on itself and dried | Not published as a figure. The Slide-Seal is a full-width opening rather than a port | Not published. The tube is described as flexible and non-kinking, insulated by a HydraFusion sleeve with a dust cover, and no bore is given |
| deuter Streamer II 3.0 L reservoir | $45 | 3.0 liters — stated | A slide-clip closure — stated, and stated to be both easy to fill and leak-proof | Not published on the listing — the reservoir is given as 330 mm (13 in) × 170 mm (6.69 in) × 50 mm (1.97 in), which bounds the closure without measuring it | Not published on the listing — no hose length is published either |
| CamelBak Crux 3L | $40 | 3 L — stated, and given also as 100 oz. The larger of the two Crux reservoirs in this group, where the other is 2 L and ten dollars less | A leak-proof cap, stated to be easier to open and close and tightened so it will not leak in a bag. The type is not named beyond cap, and no reversibility is claimed | Not published. The reservoir is stated to be easier to load and refill, with no figure | Not published. Fifteen of the seventeen listings on this shelf publish no bore, and this is one of them — on a listing whose main claim is about flow |
An Osprey pack, or any sleeve where the reservoir has to stay upright and not collapse when full
Amazon reports what buyers took in the month before this page was last checked: at least 600.
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.
Two 2 L reservoirs, 70 oz each · 4 in screw cap, the widest port stated here · bite valve with on/off · quick-release with auto-lock · a neck gaiter supplied · no bore, no film named
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.
Best for: Two people, or a spare kept filled in a fridge, where price per reservoir is the whole decision
≈ $16
