We purchased the set to get away a little from the whole plastic stuff. Is indeed often after some time no longer just nice and especially not healthy. We have disposed of a whole bunch of plastic waste for these 4 bowls. How to cover the bowls, if you want to keep something in the refrigerator? it fit some existing plan (and others) Silit pot lid, so also the "Abdeckproblem" is dissolved in the fridge or otherwise. In a pinch, it does certainly a dish.
Surely it would be a good idea for the manufacturer Silit, here also to design appropriate covers that you can attach possibly with a metal closure (for the barbecue takeaway salads etc). But it's also so, the main thing is no longer plastic. All in all 5 stars and good strong buy recommendation at the price!