Not a bad piece of kit, but it is very bulky. It is large enough to hold a 1 liter Nalgene bottle plus the water purification drops that I use. The storage zip on top is almost useless, and I do not care for the side clip as it cannot be easily replaced should it be broken. It also required malice clips so make sure you have some (I used the larger clips and they worked great) Having compared this holder to Granite's other Nalgene holder, this one is much better as it is has more insulation. I do not regreat buying it, but I think it could be better.