I do similar with some boxes from Milwaukee Burger. They're actually his favorites, to the point I worry about upgrading him someday. Ex: https://i.imgur.com/UrEnDpx.jpg he was about 800g here for reference. They're a bit roomy width wise but he loves them height wise. These cost me $0 since they weren't even for my leftovers. Bonus since they're high enough quality to be dishwasher safe so I can put them through the heat sanitize cycle as needed.