Gear Aid Frontier Pro Portable Filter 42105Provides all the benefits of a larger bottle filter in a package the size of a compact flashlight. Straw style filter attaches directly to water bottles, bladders, cups, hydration packs or directly from the water source. Attached cap keeps mouthpiece clean. Designed to fit in the palm of your hand. Flexible "Integrated Strap Grip" secures cap to filter when not in use and allows for easy cap removal. Bite Me valve can also be removed to use as hanging