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.