Designed to hold cups with circular rim around the top. Works well with most of fast food paper cups, bubble tea cups. Not suitable for parallel-sided bottles, cups, tumblers, etc. Frees up your hands while commuting, traveling, shopping in the mall/supermarket or simply hang the cup holder on the handle bar while biking, always carry your favorite drink around with no sweat. Eco-friendly and Reusable: Made of laminated water-repellent fabric with cotton lining that helps absorb water and insulate heat. Designed for long-term use. Portable and Foldable (The product does not contain a cup). 4 7/8" L x 3" H