For MTB or heavy commuting use. Improved QR mechanism is more secure and easier to use. Compatible with all MTX Trunk Bags, 20 lbs. carrying capacity. Includes two rubber bungees and safety reflector. Features: A-Type is for small bikes Perfect for mountain and trekking bikes Fits 25.4-31.8 mm seat posts Hinged seat post clamp with aluminum quick release lever Tough 6061 T6 aluminum construction Carries 20 lbs and loads with ease Includes rubber bungee, safety reflector, RedLite mount, tail light mount Specifications: Clamp: Quick Release - Fits 25.4-31.8mm (Shims Included) Material: Aluminum Beam Bag Compatibility: MTX QuickTrack System Max. Weight Capacity: 9 kg (20 lbs) Dimensions: 54 x 12.7 x 8.1cm (21.3 x 5 x 3.2") (L x W x H) Color: Black/Grey Weight: 680 g (1.50 lbs) Shop MTX compatible trunk bags.