This incredible piece of kit is not only sturdy enough to boil and serve up to 1.1 litres (almost 2 pints) of water at a time, but itâ€™ll also pack flatter than a typical army mess tin. Just sit it over your gas, electric or induction stove and the sturdy stainless steel base will heat the water inside. Once it has cooled, the tough silicone body will collapse easily into itself, ready to slide into a day pack or rucksack.
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