You really should just do some searching and reading on this site.
There are basically two kinds of cases that are popular here at PCF - briefcase style and Apache style.
Briefcase style are often made of aluminum, you’ve seen them before, and most are cheap junk - lightweight builds with crap materials that are fine for sitting on a shelf, but insufficient for carrying, full, around town. There are some higher quality ones, Versa is a brand that comes to mind.
Apache style are big plastic cases lined with this layers of DIY foam. A lot of PCFers have taken to storing their chips, in boxes or racks, inside one of these semi-customized cases. Dimension-wise, they’re often closer to a treasure chest than a briefcase, but in them your chips will likely survive armegeddon.
That’s the two-cent overview.
Personally, I’d say the best for Paulsons are the briefcase style wood and leather cases sold by Paulson decades ago. But they’re hard to find.