Stackable ATA Shipping cases, rolling Backpacks, rolling semi-hard cases, and hard-side wheeled airline size carryon cases with a built in CART that will carry 200 pounds of other baggage on top. Five sizes with twenty eight models for most travel needs. Used by professionals to transport, protect, and organize delicate expensive items like notebook computers, forensic gear, camera equipment, lie detector gear, first responder, SWAT,digital projectors, etc. Roll them "on board" and check the other bags. The CART is always there to roll up to 200 pounds of other gear on top! Visit our web site to see a 45 second video that shows how the Case to CART feature works. Porter Case makes Travel Solutions.