Head to REI to check out their travel daypack sale, where backpacks are up to 60% off. Even better, you get FREE shipping. They have brands such as Patagonia, Eagle Creek, The North Face, Marmot, Osprey, and much more! Some backpacks start as low as $21. Others are 50-60% off, and are saving you a bunch of money! Click here to look at what they have.