At Hill People Gear, we've always understood that not everybody uses their gear in the same way. As a result, one of our design principles is interchangeability of components. Our larger packs are engineered to accept a variety of back pockets. This lets you swap a single constantly loaded back pocket between a couple of different sized packs, and it also allows you to maintain different back pockets set up for different uses for the same backpack.
Every Pocket a Pack expands on this interchangeability and allows you to to use your favorite pocket either as a small pack or a sling bag. All of our largest pockets (Palspocket, Tarapocket, Admin Pocket) have foam inserts in framesheet-like pockets for stiffness when used as a pack. If you need even more support, you can add a pocket framesheet for $3.50. Your new favorite small pack might just be the HPG pocket that you already own!