I ordered the 21 oz to use for lunch and found the lid difficult to open. I use a grip material to open it. I put soup in it and it only stayed warm a few hours, I think I need to heat my soup very hot before I put it in.
Also, I accidently dropped the plastic container/lid and the lid now has a small corner chipped off. Was surprised the lid wasn't durable. Is there a replacement for the lid?