I thought it would be cool to add a variety of our popular cash stashes. All of the cartridges are made to the exact specs of the actual round. It is much easier to put a rolled up bill in each of these compared to the Mini Cash-Can. Except for, that is, the .357 Auto Mag. Therefore, I insert a US $2 bill in each of the 357's as your folding instructions. The 500 Action Express holds 2 bills. A 24" neck chain is included with the 45 ACP and 357 Auto Mag Pendants. A jump ring or split ring can be installed if you would rather carry these on a key ring. The Zipper Pulls, well, I think the name implies the intended use of these. Great to stash an emergency bill, or small medications on a zipper or a key ring ,if you prefer. All of these stashes have rubber o-rings, which not only makes them waterproof, but insures a snug fit to keep the caps from beoming loose accidentally.