The perfect marriage of two classic blackburn products a cargo rack and bottle cage in one the outpost cargo cage provides a solution to carrying your odd shaped gear along for the ride securely strap down odd size bottles and other gear such as bags and clothing mounts to 2 standard bottle cage bosses three sets of mounting holes to fit different size frames included silicone backed webbing straps prevents your cargo from jostling free 6mm alloy tube construction 4kgs88lbs carrying capacity