Crushproof Hard Shell Outer: Unlike flimsy Comic Book Bins, our Comic Box case has a hard shell plastic exterior that prevents your valuable collectable graded comic books from being crushed. Heavy duty comic book storage Exterior: 16" x 12.5" x 6.5" Customizable Foam Interior: Includes two layers of pre-diced 1.875" thick foam for customizing your Comic storage and creating the perfect graded comic book bin, sleeved or loose comic holder or collectors case. Usable space: 13.5 x 9 x 4.5 Holds 8 CGC graded Comic Books or 30+ Loose toploader comics sleeves: The interior foam can support multiple layouts, so you can store a single stack of graded books or create book holder slots for the exact size of your comic collection Waterproof & Airtight Design: This case features a waterproof o-ring seal that locks out air and moisture for a truly protective Comic Book Storage. An integrated pressure release valve allows for air release when changing altitudes Comfy Trave