Wormholster

Wormholsters are small wormhole generators that can be carried on the body. When a Wormholster detects a hand is near it, it activates, opening a small wormhole to a designated storage location where any number of weapons and tools can be kept. This makes it pretty much a holster that is as big on the inside as it needs to be, but is small and easy to hide and carry. They are a closely-guarded proprietary technology, and they also require substantial amounts of energy, so they are only practical for the likes of government-sponsored military personnel who already wear power generators.