This Breast Pocket wallet is my checkbook. A checkbook will fit in any of the 4 vertical pockets. It'll fit more cards than my other 2 wallets, but I don't keep any cards in it. Thanks to technology, I really only keep my checks around for old times sake. For reference, it will comfortably fit up to 4 standard size credit cards in each of the 7 pockets, or around 10 standard sized business cards per pocket. US Dollars fit vertically on either side of the fold. Any size Euro will fit just fine as well.
closed/empty dimensions- 6¾" x 3¾" x ¼"
card pocket/empty dimensions- 7 @ 2¾" x 2⅝"
large vertical pocket/empty dimensions- 4 @ 6 - 6¼" x 3"