Patches are what make a backpack a HEDi-Pack. Whether you’re buying them from us, finding them somewhere else, or making them yourself, the HEDi-Pack was designed to showcase your patches. Official Licensed Hook Velcro Washington State University Primary WC Mark 3.75”W x 3.75”H Patch Don’t know where to start? Think of the moments, milestones, relationships, traditions, and journeys that shaped you—each and every one of them could be a patch you display proudly.