I bought this a few months before I wrote the review because I wanted to see how useful it would be to me. I average 550 to 600 miles a month. First, it's very convenient. I'm 6'4" and 240 pounds. It fits me perfectly, very light, I don't even notice it on my back. Second, it holds more than everything I need for a day bike trip. Including rain gear, extra Shirts and layers, tools/sports headbands and gloves, first aid kit, snacks and energy bars, and a hydration bladder (only used once for…