If you commute to work on the Brompton Electric and you'd like to bring your laptop and other gear, you'll want the larger 20L City bag; it carries the Brompton Electric battery and a lot more. It has a front pocket, a big main compartment with a suspended laptop holder, and two rear pockets that face the rider while riding the bike, making them ideal for a water bottle or your coffee tumbler. There's also easy access to the USB port on the battery to charge your phone. The color of the bag is black, and it's made from the very durable Cordura fabric. For riding in the rain, the City bag comes with a high-visibility cover with a reflective band that'll keep you noticeable and your stuff dry. The bag is only compatible with the Brompton Electric bicycle (battery not included). It's dimensions are approximately 17 (W) x 7 (D) x 11 (H).