Okay, WHAT are these people doing to their containers that are causing cracked lids and warping them in the microwave? We started using these about two years ago, then bought more because we liked them so much. We've added to our collection at least three times. We use them for frozen food prep, leftovers, lunches, snacks, bulk food storage, and even miscellaneous organization. I actually just came onto the site looking for narrow, taller versions of this design for pasta and cereal storage. Have we noticed some white pitting in some of the containers? Sure - that's what happens when you let casserole go six weeks past its overdue date or if you decide to microwave literally anything with tomato sauce in a plastic container. Warping? Is the life skill of not microwaving a sealed plastic container not shared these days? These lids conveniently vent if you lift them off and rotate them about 45 degrees so that they still cover the majority of the food while nuking it. Or maybe just don't place hot foods in a plastic container and seal them with an airtight lid and then stick them in an ice box before the contents have cooled down. They're plastic - not glass or metal, which are more resistant to things like heat vacuums. We have tossed a grand total of one (1) container since we started using these, because the amount of neglect we inflicted on it rendered it so pitted and odious that nothing we did could save it. We haven't even lost any lids, much less cracked one. I put everything through the dishwasher - top shelf for all except the largest containers and lids. These things are sturdy. I recommend them to my younger colleagues who are just starting their homes and are looking for inexpensive and reusable tools and many people at work use this product to bring their lunch. All you have to do is take care of it just like anything else you want to last for a long time. They don't look like a million dollars and they don't have to because they do exactly what you expect for a reusable plastic container and lid - which happen to conveniently snap together for easy parts organization.