Port Designs Hanoi 13.3" Clamshell CaseThe Port Designs Hanoi Clamshell is a sturdy yet lightweight 10 13. 3" laptop bag. Its modern and popular style was developed by our designers in our creative studio in Paris. This bag is called a Clamshell bag because the zipper allows it to open up completely, going around the structural frame of the bag. This system allows you to secure your computer in the bag more easily using a hook and loop strap that will encase your laptop and prevent it from