They're great huge sacks of rice - you can maybe fold over the top, but short of putting duct tape over it every time you need more rice, there's no sealing to

They're great huge sacks of rice - you can maybe fold over the top, but short of putting duct tape over it every time you need more rice, there's no sealing to do. I'm sure many people do that anyway, but I wouldn't trust many restaurants to, nor many shops.