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The thing about water bottles is they take up a fair amount of space. Not so the Ultraflask, which is made from a soft, flexible material and can simply be rolled away when empty. It's also incredibly light, weighing just 41g. You can even freeze it, so on really hot days you've got a supply of slowly thawing icy water.VERDICTdesigned for trail runners, and excellent for hillwalkers, this ultralig …

The first aspect of the Ultraflask you will notice is just how packable this water bottle is when collapsed, fitting neatly away into your rucksack or hip belt. Described as being for use with running vests and packs, we quickly adapted it to suit mountain walking. It has a long tube which can be adjusted to suit the users need. Weighing in at a tiny 42grams we took it down to an even li …