I'm an avid southern California camper but I'm looking to get into backpacking. I'm on limited funds and am trying to keep my bag under $100. On paper, both the REI Trailbreak 30 and the Kelty Cosmic Synthetic 40 look pretty similar and would fit my bill. The biggest difference I notice is the Cosmic does offer a little more room in the hips at the expense of not packing down as small. Any input or advice would be greatly appreciated.