Yes, another Gift box!, Full disclosure: I've never actually played any of the Portal games. I know people who have played them and loved them, but
Weighted Companion Cube - Portal Wiki
companion cube gift box by 3D Models to Print - yeggi
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Portal 2 Companion Cube Lunch Box Tin Crowded Coop - ToyWiz
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Portal Companion Cube
I know people who have played them and loved them, but I’ve never actually played them myself. You can order the cube with a ring holder, with a foam
Portal Companion Cube Gift & Ring Box