Millions of men suffer from carrying thick, unwieldy wallets that are uncomfortable to sit on, cause back pain and, worse, hold cards in inaccessible stacks hidden within worn out pouches.

An article in the New England Journal of Medicine (Aug 25, 1978) documented cases of “credit-card-wallet sciatica” as pain resulting from sitting upon a thick wallet (over 1” thick) for extended periods. In today’s credit card economy, most people carry thicker wallets than in 1978.