Topeak's MTX BeamRack is an awesome way to add touring capacity to bikes that won't accept conventional racks, such as dual-suspension mountain bikes. The quick-release mount clamps firmly to your seatpost and this rugged rack boasts durable aluminum construction capable of supporting up to 20-pounds with ease.
Bontrager's BackRack L is made for mountain and hybrid bikes with frame sizes 18 inches and over, and road bike frames 54cm and over. This durable and light rack is perfect for turning your bike into a commuter and errand-runner. Tough and rustproof stainless-steel hardware is included and the single-bolt strut mounts allow for maximum adjustablility and ease of installation. And, the BackRack is compatible with standard trunk bags and panniers as well as Bontrager's Interchange models (sold separately).