I've had at least two amphipod bottles of the original design in the past, one with insulation, one without. Both had a small zippered compartment that I usually use for gels. They both worked well for me and I've used them for many long runs and races. This version is a bit smaller and easier to hold as it's thinner, but I had trouble squeezing the bottle to pour out water and during the race this shouldn't be a problem! The first time I used it in a race, one of the gels under the elastic came loose and fell out. I'm frustrated as it's easier to maintain, but never mind if it's not functionally complete.
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