Great product, works as intended and can be reused many times. Plastic is thick and durable and the lids pop off easily, however a good number of them have flaws:A good 10% of mine were duds, they had broken caps or cracked plastic right away, so those were unusable. Some are also a bit greasy for some reason, so I didn’t use any of these without cleaning them first.Another 20% had the lids break off after the first use, so these weren’t exactly reusable. The plastic part that connects the lid is the main design flaw. It is very thin and breaks easily, but the product is otherwise high quality.The rest of them (about 350 of the 500) were great! I’d say I still got my money’s worth for $50, even though a lot of them were defective.