Bring more, carry less. Generously sized for your longer pursuits, our 32 oz (946 ml) Lightweight Trail Series bottle is 25% lighter than our other 32 oz bottles thanks to an innovative stainless steel design. Engineered to deliver the same cold refreshment you expect from Hydro Flask but without the weight, the Trail Series makes it easy to take your cold hydration as far as your spirit of adventure takes you. .