Product Detail: Color: Black Brand: ROCKBROS Material: Polyester Size: 20*10.2*3 Inch Capacity: 10L Features: Large Capacity & Foldable: The maximum capacity of the bikepacking seat bag is up to 10L. Keep your gear easy and enjoy your bike packing camping trip. The roll top closure design adjusts the length of the saddle bag to meet your different capacity needs. Also for commuting, it's nice not to have to use a backpack in the summer heat. Easy to Attach & Stable: The bike saddle bag includes a foam insert that rests against the seat post so you can really pull the support straps tight and get a snug fit. The bike seat pack stays stable during your cycling trips. No tools required, suitable for various bikes, road bikes, mountain bikes, dirt bikes, BMX, MTB. Waterproof: The bike bags with waterproof inner lining. Keep all your gear dry even through the rain! Enjoy your cycling trip no matter it's sunny or rainy. Strong & Durable: Bicycle packing bags with 4 PP panels that keep the bag in shape and protect items from extrusion. Reflective & Extra Space: Reflective patterns and logos increase your night visibility when cycling at night. The bike bag has an elastic strap for external cargo! The bike saddle bag can be used as a FENDER when rain, greatly reducing the muddy water splashing on your cloth.