GOTO specialize (among other things) in the production of storage boxes for collectibles, including even Bearbricks. And of course for smaller collectibles like dolls and figurines. The display boxes are made of superior antioxidative PP resin material that is high transparency, good stiffness and scratch resistance. Panels have a high light transmittance of 95%.
You can find GOTO official store on Amazon here: https://amzn.to/3nBuxWy
GOTO official store on Aliexpress here: https://ali.ski/aju2gz
The transparent display box is easily stacked throuth the groove at the top which is convenient to be freely superimposed and keep them away from falling when tilting. The clear display box would be a good gift for your friend as a collectibles lover.