The Platypus Big Zip SL Hoser hydration system opens at the top via a plastic slider making filling and cleaning really easy; there's no way this can leak. Full marks for the detachable hose. The Platypus Big Zip SL Hoser is tough and a good shape for most packs. Delivers a decent slug of taste-free water, although the flow rate is a little slower than some.
Contact: 01629 580484, www.firstascent.co.uk
Verdict A superb hydration reservoir with some really useful features. Slower flow rate than some.
Reviewed by Country Walking 2008