In general, bags require quite a bit of effort and know-how to make well. A sling pack, on the other hand, isn't terribly difficult and is really one of the cooler packs you can put on your back.

Folded mode: Perfect for packing light or tucking the bag away when you're not using it. Backpack mode: For hands-free carrying when you need to haul a bit more. Sling mode: Ideal for quick trips or ...