UPANBIKE 130lbs Capacity Mountain Bike V-Brake Disc Brake Bicycle Alloy Rear Rack Quick Release Mounted at Seatpost Carrier Luggage Pannier with Side Protecting Frames Quick release mount at seat post. Suitable for seatpost diameter under 33mm only. Fits V-brake and Disc brake bike. It is adjustable for many kinds of bike, 26" 700C fits well. Large capacity: Manufacturer suggested 25kg or 9kg(when only install via main girder on seatpost); In fact it can carry over 60kg as we tested. But not suggest long time carrying over 60kg. Weight: about 2.8lbs; Full Length 54 cm, Panel Length 35.5 cm; Width 14.5 cm Quick release to install at seatpost; Quick release at bottom of the rack, easy to adjust position of rack platform With rear reflector, make you safer to riding at night.With side protecting frame, make your luggage not scratched by the wheel or spokes