Of course you can always detach the straps from one backpack and re-install them on another, but that process may take several minutes. Alternatively, install the attachment straps on multiple backpacks and just leave them in place. That way no matter which backpack you grab - it's ready to go. Once the straps are installed, clipping in and out takes just a few seconds.

The 'Ab Bag' is worn using only two connection points, while the 'Gear Gut' uses four connection points along the shoulder straps: two at the bottom and two at the top. Attachment straps for the 'Ab Bag' are the same as the bottom attachment straps for the 'Gear Gut'. And these are universal (i.e. fit all backpacks except non-traditional designs). The top attachment straps for the 'Gear Gut' are offered in three varieties. Your 'Gear Gut' purchase includes all three varieties so you can pick and choose one that works best with your existing backpack. Once you know which type of top attachment strap works best for you, make a selection based on your preference form the three varieties provided (e.g. Clip Buckle, Cam Buckle, or Extended Cam Buckle).