I only have a 13 litre fresh water container in the cupboard under the sink, I made a 4 inch high 'skirt' to go around the base to keep it in place, and the way the Mrs packs the rest of the cupboard 'Tetris' style there is no way it will move anywhere! No room for waste containers, but we don't use the sink anyway, it's a bread bin/Tea/Coffee storage zone.