I bought 3 packs of these Tub-its from Tesco last night. They are by Baco and have 5 in the pack with lids and the packs I found have free writeable fun stickers included. Ideal for kids packed lunch or for all those leftover bits from xmas, to put in the fridge.
They are suitable for the fridge, freezer, Microwave and dishwasher.
Bought from Tesco Durham. Dont know if they are store specific or not. They were £1.77