IKEA UTBJUDA Lunch Box Stack Adapter

Ironically the UTBJUDA stackable lunch boxes do not stack with other UTBJUDA stackable lunch boxes when the lids are fitted haha.

To solve this first world problem, I made this basic adapter so multiple lunch boxes can be stacked on top of one another.

I also made another version which allows plastic takeaway containers to be stacked on top of the lunch box. Please see my profile for this model.