The original BOB, the YAK trailer carries up to 70 pounds of groceries, laundry, or auto parts (for when your car breaks down). It attaches to virtually any bike's rear wheel hub, including nonstandard 29er and tandem wheels, creating a low, stable, center of gravity; improved performance; and excellent aerodynamics. YAKs are compatible with full-suspension bikes as well as those that have solid-axle hubs.

Yak 28 trailers are for 28" wheels, 29er mountain bikes, and 700c road bikes with full wrap fenders. Santana version designed for 160mm rear spacing of Santana Tandems. Yak Plus models include the BOB Dry Sak.