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Updated in 2021, the V3 Responsiv 18L shares all the features of our best selling Responsiv 12L, but with extra capacity and a secure zipped rear compartment. Go Longer, Further and Harder with the Responsiv 18L. We have made this race vest for people who need to carry a little more equipment, maybe on a longer Ultra, a FKT attempt or a winter challenge when more clothing might be required. This trail running pack is perfect for long races with less aid stations and expected poor weather!