The matching 100 Cling-cover, for example, for the fridge. These of course are not intended for the canning because they do not seal hermetically.
My wife and I have the Weck glasses for their quality (of kochfest to freeze), easy care (eg dishwasher, boiling, etc.) and versatility in the use of very learned to appreciate.
The wholesomeness of food storage in glass, the time actually unlimited longevity of Weck glasses and avoiding general garbage (Metal Closures etc) speak for this eco-friendly system.
We use the camber shape for boiling down to load vegetables lactic or even in the refrigerator aufzbewahren as easy and hygienic to clean kefir culture glass, for cooked foods (eg also for taking along to the office, then the wake sealing rubber and metal clips) etc.
Criticisms I have no - only for loading milk sour vegetables I'd still like to see 3 to 5 liter sizes.
Now that we are very satisfied for some time with the preserving jars - a very strong buy recommendation :-)