HATPAC is a backpack and a hat carrier that was designed to help protect your best hat, laptop, and other valuables. The patented construction is not only functional but is also comfortable to carry. Custom moldedrigid outer shell and interior hat tray fit most hat sizes up to a 4 1/2' brim. Interior laptop pocket fits most laptops and/or tablets. Additionalinterior pockets to stash your headphones, passport, trophy buckle, etc... Exterior water bottle pocketandtrolley strap to help you through those layovers. Built for the long haul so pack your hat and we'll see you down the road.