A little information about ArchPort.
ArchPort footwear include removable compartments in the soles. They are patented under US Patent 6,094,844, and include two compartments (one in each sole) in the arch region of the sole. All ArchPort footwear include a compartment in the arch region since the arch is the most biomechanically correct placement. This is the first footwear in many years to enter the market with a utility patent. There are many design patents, but very few utility patents in footwear (in history) that reach the market.
Arch Port stash sandals (and other ArchPort footwear) include a wallet clip that fits into the sole that can carry several credit card items, cash and a key. The wallet clip snaps securely into the sole. Either compartment can also be used without the wallet insert. The bottle opener sandals include a hook and loop closure to secure the contents. For example, the current promotion is a flashlight and multi-tool that fits into the sole. It is placed directly into the sole and secured to a cavity by Velcro, then enclosed by a cover.
Technical Background: The primary impact areas of the foot while walking are at the ball of the foot and the heel of the foot. The arch area is the “rolling’ area, subject to less impact. Therefore I concluded it is the best area to place a compartment. The name ArchPort came from the idea that the compartment is in the arch, and also from the idea that it is a port which can one day be used to interchangeably carry various items, including GPS, music and other forms of data and data communications.