i too have a collapsible platypus for about 4 years now with steady use. it hasn't leaked yet. thought this brand might perform the same but with improvement of the built in carabiner. guess not. after posting saw the vapur on amazon. many reviews state that its very durable, took some abuse and didn't leak, a very few did say the product leaked. with this, better to stick with the platypus and just rubber band it. besides, the platypus has  hole for a carabiner... thanks MM!