The camelbak circuit hydration vest one of our most popular running vests just got an upgrade the new version of the circuit is 30 lighter and includes a 15 liter crux reservoir that delivers 20 more water per sip and of course it still offers all of the features that make it a favourite for bonk free races and long runs front storage pockets for gels and fuel a secure zippered pocket that fits most phones and reflectivity to keep you visible when yoursquore on the move the two