Transaction cards having one or more folds therein for compact and easily stored transaction cards are provided. Moreover, foldable transaction cards are provided having one or more holes or apertures therein for holding key chains, or other devices for attaching the transaction cards to other items, such as sets of keys, wallets, or other items. Other embodiments include spring-loaded clips on the foldable transaction cards and protective sleeves, housings or cases for full-sized and smaller-sized cards. Still further, transaction card systems are provided comprising a case or housing for holding and/or storing foldable transaction cards therein, such as foldable transaction cards having a dimension, such as a length dimension or a width dimension, that is smaller than traditionall-sized transaction cards.