Hydrapak ULTRAFLASK 500Lightweight and fully compressible, the Hydrapak Ultraflask 500 is a great hydration system for adding to your running vest, pack or belt pocket. Keeping you in the zone the bite valve offers a high-flow for quick hydration on the go with an auto-sealing structure that prevents leaks. The flask is constructed from durable TPU material with RF welded seams and is suited to the harshest of trail and outdoor conditions.SpecificationsCapacity: 500mlDimensions: 255mm x 60mmWeight: 54gMaterial Construction: TPU HDPE, PP/POM, SiliconeFeaturesA great hydration addition or replacement to your running vest, pack, or belt pocketVest-pack fit provides bounce-free stability and a flexible flask shoulder to prevent chafing so you can focus on FKT’s and PR’sHigh-flow bite valve auto-seals after each sip, eliminating annoying dripsLarge standard 42mm opening lets you fill the UltraFlask easily with ice and drink mixesCustomise your cap with two options depending on your run or vest, directly mount your bite valve or use the straw cap (which can be cut to any length)Made of ultra-durable, abrasion resistant TPU and RF welded seams for superior durability and elasticity100% BPA and PVC free, wide working temperature range (can be frozen – max temp 60° C / 140° F)Buy Hydrapak Water Bottles from Chain Reaction Cycles, the World’s Largest Online Bike Store.