A small, typically adhesive-backed accessory designed to hold cards and sometimes cash directly on the exterior of a mobile device or its protective case. Functioning as a minimalist alternative to a traditional billfold, it allows users to consolidate essential items with their cellular telephone.
This facilitates convenience by minimizing the need to carry a separate purse or pocketbook. The design offers a streamlined approach to carrying payment methods and identification, enabling quick access and reducing the potential for misplacing essential cards. Originally conceived as a practical solution for simplifying everyday carry, it has evolved into a popular accessory reflecting the increasing integration of digital devices into daily routines.