Before you can enter the Cave of ... Tracts of Land, you need your trusty dice. And to keep them safe, use your 10 levels of Craft: Altoids to make this dice case!
Step 1: Cut some foam
Cut it to this size:
2.25" deep (front to back)
3.5" long (side to side)
0.75" inner height (from inside bottom of tin to rim)
Cut a bit extra off the height to make it easier to remove the dice.