Zipp wheel bag dual holds two wheels protect your speed weaponry in transit to the race each wheel slips into an individually padded pocket there are additional placements and a stuff sack for race supplies like quick releases co2 cartridges mini pump spare valve extenders or tubes the exterior is surrounded by a thick layer of high density foam to soak up the big hits while the thick skinned nylon cover resists punctures and tears includes a removable adjustable shoulder strap and non