The Quantum belt is in a category of its own. It is lightweight, low profile and can carry enough nutrition for several hours. The product could be used for quick 2-4 hour hikes where you don't want to lug around a bulky pack, or for running races on sporadically supported courses. *Disclosure: I own a running specialty store and UltrAspire is a brand that I sell. I was given this product for review purposes and was able to keep it. When I first tried this out for a 1.5 hour run I was concerned… Full review
UltrAspire specializes in products for ultra-athletes, including belt systems, multi-sport packs and bottles.