Heading out on a bike trip? This expandable tail bag gives you plenty of storage without looking bulky. It's 30 liters normally but zips out to 48 liters when you need extra space—perfect for a weekend ride or longer tour. Made from waterproof polyester and includes a separate rain cover for total weather protection. Attaches two ways: use the straps to secure it to a sissy bar or backrest, or use the four included straps to mount it directly to the rear seat or rack. Dimensions are about 18x12x12 inches. It also converts to a shoulder bag or handbag thanks to the adjustable shoulder strap (32 to 54 inches) and side handles. Great for carrying clothes, tools, or gear. Durable, versatile, and keeps your stuff dry. Makes packing for a ride so much easier.