Below are some photos of a box that I am using for my travel paint storage box. I took a small piece of wood, cut 2 slits in it and then glued it to the bottom and side of the metal
Organized Paint Storage Closet Ideas - Bless'er House
Go Vertical: Easy Space-Saving Acrylic Paint Storage Dream craft room, Craft room storage, Acrylic paint storage
Paint Storage Shelf Made With 2x4s - Create and Babble
Dollar Tree Mini Crate Storage Organizer for Crafts
Bruce's Woodworks - Paint Shelf
Craft Room Organization - Paint Storage Box - Remodelando la Casa
Craft Room Organization - Paint Storage Box - Remodelando la Casa
MIXRACK Modular Paint Storage and Hobby Workstation by Grim Rabbit Games - Gamefound
IHeart Organizing: Our Storage Spaces: Storage Room Paint Organization
PLYDOLEX Wooden Craft Paint Storage Rack with 58 Holes for Paint Bottl – Plywood Organizers for Miniaute Painters - Wooden HandCraft Gift and Accessories by Plydolex