What Our Gearhead(R) Experts Are Saying:"The SL version of the Traick 5L fits my frame way better than most running vests-it hugs close without restricting breathing or movement. I've used it for shorter mountain runs, and everything stays put, even with poles and a full water load. Super breathable and just the right capacity."When our run calls for a low-profile pack that moves with us-not against us-the Traick 5L SL Backpack from Deuter delivers. Built with a Slim Line (SL) fit that's designed for smaller body types, this minimalist vest-style pack offers a bounce-free feel and dialed-in comfort for high-output trail runs and shorter endurance events. Despite its compact design, the Traick 5L SL carries more than you'd expect, including two soft flasks, front and rear stash pockets, trekking pole loops, and modular bungees. A hydration bladder sleeve and zippered back pocket round out the storage options, while breathable 4-way stretch mesh and a soft-touch fit keep us cool and chafe-free on the move.