Airtight and water tight when the little lid hole is sealed with the silicone plug. Dishwasher safe. Doesnât colour or flavour the box when it is washed with tomato sauce in the same dishwasher, which is better than plastic! Not had the guts to use it in the microwave so canât comment on that! Perfect sizes and they nest for storage, although mine have been in use constantly since purchase.
Fits across our sink perfectly so thereâs space behind to rinse and pour dregs away. So good not to be using plastic - so good that Iâve bought a second one. Would highly recommend
Both boxes are sturdy and well designed, I was surprised how much the smaller one could hold. I will be using them for many years.