HYDRAPAK ULTRAFLASK SPEED 500ML BOTTLE £26

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. VERDICT Designed for trail runners, excellent for hillwalkers, this ultralight, flexible bottle saves space and weight.