They say that carrying your cash it your pants if the safest option. It is however not the best option to pull some cash out of your pants when paying for groceries. That's why the Underpants Wallet is the best of both worlds. Your cash is in your wallet, but also in your underpants.
The Underpants Wallet is soon becoming the norm when it comes to carrying your cash.
The Underpants folding wallet measures (10.8 cm x 8.9 cm)