IMPORTANT: CHECK WITH YOUR STATE AND LOCAL LAWS AND REGULATIONS REGARDING THE PURCHASE AND USE OF KEYWAY TOOLS.

A while back I got into locksport, and when I upgraded my lockpick kit, it came with a bonus set of mini keyway tools (lockpicks and tension wrenches) in a fake credit-card style case. The tools themselves are good stainless steel, but the case was lousy. It'd pop open with the least amount of pressure, which meant tools could scatter in a wallet or pocket.

I began with a known design by chris3art which proved really good for holding microSD cards for my Raspberry Pi. The design at least gave me the necessary information regarding space tolerances for the hinge and latches, as well as proper dimensions for a card-size case.

The lockpicks, being thin as they are, required some additional design...2 latches and a rim around the edge to prevent the tools from slipping out should pressure be applied to the edge of the case.

Of course, before you take this out into the wild, be sure you get a locksmith license.