Abstract: A modular bottle (e.g., for holding liquid or dry storage contents) and its various assemblies, components, and structures are provided. The bottle can include a body portion including an open longitudinal end and an interior region, an end cap configured to be secured over the open longitudinal end to enclose the interior region, and a flexible loop. The end cap can include a pair of knobs disposed on a circumferential side surface of the end cap. Each end of the flexible loop can define an aperture that is smaller than a largest diameter of each of the pair of knobs such that each end of the flexible loop is selectively couplable with each of the pair of knobs.

Abstract: A modular bottle (e.g., for holding liquid or dry storage contents) and its various assemblies, components, and structures are provided. The bottle can be flexible or rigid and is dynamically modular to be particularly useful for outdoorspeople, military personnel, travelers, pet owners, and the like. The bottle is a double-ended device capable of being modified or expanded with various caps, filters, spouts, compartments, and like accessories.