Love these! Hadn't been able to find various sizes of these jars for a couple years. I use them for fermenting - sauerkraut, Indian preserved lemons, Moroccan preserved lemons and limes, vegetable mix... I've even used the 2.5 gallon jar from this set for making Chinese red rice wine. Love them. They're sturdy. Use the Stone Creek Trading glass crock weights - 6.5" diameter is the best size for this, unless you want the weight to rest in the neck (risk of overflow) in which the 5.5" diameter works well.