BiKASE BIG DADDY Trunk Bag with Panniers offers simple and secure on-bike storage that's easy to install and remove without the need for tools. It has multiple pockets to keep you organized, with built-in expandability, built-in panniers for extra carrying capabilities, a durable design with reflective materials, and rain cover to keep your gear safe in all conditions. Added sealed liner that can hold ice and a rear oversized bottle holder. Compatible with Velotric Nomad 2, Nomad 2X, Breeze 1, Discover 2, Discover 3, Discover M, GoMad and Summit 2 (Modular Rear Rack Required).