Nelson-Rigg SVT-750 100% waterproof sissy bar backrest 2-piece luggage for cruisers Electronically heat welded seams makes this bag 100 percent waterproof and an air tight roll closure ensures no water enters the bag Compression straps easily adjust to volume of content Black with Hi-Visibility reflective accents and made from waterproof and durable tarpaulin PVC with a coated outer material to prevent slipping or marking Firm internal base plate helps support bag, attaches using the unique Full-Nelson mounting system and the included roll bag can be mounted separately Main compartment measures: 16 inch length x 10 inch width x 18 inch height, holds 47.20 liters; Roll bag compartment measures: 16 inch length x 10 inch width x 8 inch height, holds 20.98 liters; Dimensions for both bags (exterior): 16 inch length x 10 inch width x 26 inch height