This is a nice shirt for running. Funky design that dumps heat reasonably well, and comes in eye-catching colors. Although on really hot runs, I find it more efficient to go shirtless anyway :). I would not recommend this shirt for anything other than running or gym wear, as the mesh on the back seems fragile, and I'm afraid that a pack could swiftly wear out the mesh on the back. That said, the extra length in the hem that would presumably fit under a hipbelt seems pointless to me. This shirt also retains odour in the underarm mesh, but the primary fabric does not retain much odour. That said, get more than one, or be prepared to wash it lots or put up with a bit of BO.