@Lil Dab has been known to use them but he uses the junior size which holds half the amount of soil! They can make a mess tho as u supposed to pile the medium above the top of the box even before u come along and topdress later so every time u pull cover off u dump dirt and shit all over the tent floor and i am OCD about keeping mine clean! I prob coulda fit another 1-1.5gal of media into the full sized vs just using a single 1cu ft bag of soil but wanted room to topdress during grow and then to be able to add something like KIS nutrient pack to bake in before next round! With a sealed cover can bake right in the tent in the boxes!