Hat cans fit up to a 4.5 inch brim, so it will protect the biggest of brims. The hat can is smaller than the cardboard box your Greeley is delivered in, so it protects your hat and saves precious space in the truck on the road.
A hook-and-eye closure allows you to add a travel lock to your hat can. Locking up your hat can means you can check it with extra luggage when you fly. You can also carry-on your hat can, as it is small enough to fit in the overhead storage bin and takes up less space than the cardboard Greeley Hat Works box your hat is delivered in.