Bushwhacker Mesa Red - Bicycle Trunk Rack Bag w/ Rear Light Clip Attachment & Reflective Trim Cycling Rack Pack Bike Rear Bag Frame Front Accessories Made with durable 600 denier polyester fabric. Fully padded, insulated interior. Rear light clip attachment and reflective trim for visibility. 4 point velcro mounting system for easy, secure attachment. Dimensions - Main Compartment: 12" L x 6"W x 7"H. Side Pockets: 10.5" L x 2" W x 5" H.