Here's a backpack that is great for those days that you didn't even realize you needed a pack. The Hammock Bliss Ultralight Travel Daypack packs down into a little sack when not in use, then pulls out into a full 1100 cu in. daypack that weighs just 6.5 ounces. The top-loading pack is made of lightweight, water-resistant nylon. To store, flip up the side pocket and stow the pack inside. Throw it into your glove compartment or bike pack and have a backpack at the ready so you're always prepared for a trip into the wilderness. The pack would also be great when you're traveling to a hiking/backpacking destination and don't want to lug the weight and bulk of a full-fledged backpack. Best of all, it only costs $30--not bad for such a versatile, lightweight pack.