Used a backpack for years. Due to a back injury, the pack wasn't working for me anymore unless I bungeed it on the rack of my touring bike. Recently bought a Lone Peak handlelbar pack and a 2nd mount. Can ride with it either on my touring bike or one of my faster rides. It unclips quickly from bike and I carry it into work on a shoulder strap. Amazed how much I can put in the thing. Yesterday I had clothes ( including a pair of jeans), sandwich, apple, some carrots and grapes, 2 bananas, wallet, phone, 7" notebook computer, rain jacket , orth. shoe insoles and spare glasses in case. Only the sandwich got a liitle squished