I have a great dakine backpack that holds everything I need: it has two water bottle holders, an insulated pocket for food, a laptop sleeve, and it is very stylish. However, my back is drenched after just a few miles. Among fellow fixed gear riders, chrome bags are very popular because of their durability and protection against rain, but I'm wondering if a hiking backpack with a raised mesh part in the back would be best. My friend thought they might put stress on my back and cause me to have bad posture while riding, anyone have suggestions? I don't want to spend an arm and a leg either (by the way, backpacks are on sale at REI right now)