Osprey Hydraulics Reservoir RRP: £34 Weight: 21g (2 litre) I switched to using hydration bladders over bottles about 10 years ago and despite the faffing involved with cleaning and drying I wouldn’t go back. I drink more, find the reservoir is more comfortable in my rucksack, and they are generally easier to fill from streams than bottles. In recent months I’ve been testing a 2 litre Osprey reservoir and as it’s been winter, the optional insulated tube and bite valve cover that goes with it. The resevoir is made from BPA and PVC-free flexible thermoplastic polyurethane, which despite feeling thin…