This isn't just any hydration pack. The Geigerrig system uses a small bulb-shaped hand pump that pressurises the reservoir, meaning that there’s no need to suck the water out – it'll just flow when the valve on the end of the hose it bitten.
It’s a nice idea, but it seems no more or less effective than a normal system. The pack itself is good, though – it’s made from rip-stop-style fabric and adorned with chunky zips. It’s comfortable to wear and comes with both chest and waist straps that keep it still on your back even when it gets really bumpy on the trail.
With a capacity of just over eight litres (and a two-litre bladder), there’s enough room inside for a day’s worth of trail essentials, as well as two pockets that are perfect for a phone and keys, with a headphone port too.