Of all the food containers we've tried, these are easily the best. Guaranteeing a 100% air, liquid and moisture-tight seal, they're also easy to open and close with just four simple clicks. Freezer, dishwasher and microwave safe, they will stack or nest one inside another to save valuable cupboard, fridge and frezer space. Durable too (the hinges were flexed 3 million times in testing!), we highly recommend you try them for yourself.