We use these (exclusively) for our Hazardous Waste Satellite accumulation drums. They easily latch down to keep flammable fumes from escaping, yet have nearly full openings for putting in large items like gallon cans and boxes. Ours are used hard. We fill an average of 6 to 10 drums per month, which is a lot of opening and closing, and the lids are usable for 10 to 15 months before we eventually break the hinge. (prior, similar, products lasted a max of 6 months before they were broken). The only negative I have is the shipping packaging. We have received several in damaged condition due to shipping damages (it's obvious that the container was broken when dropped or crushed during shipping). I have contacted PIG, and they have quickly replaced the product, but they really need to improve the cushioning of their package, which I have also discussed with them. Maybe the next one we get will have improved packaging!