Those Thermos cups -- I bought 3 of them at WM. I think I bought the last 3 in the store, they were lying around on shelves in different places when the school stuff was out. $10 a piece stainless inside and out.
My dd threw hers in a store and the top snap on plastic lid flew off and a portion broke off -- not toddler proof, still works though. My ds2 throws his, it's fine but man it hurts!!!
I do like them though.
I bought the stainless steel Thermos soup cup for my ds1 to take to school. It was $15. I first bought the regular plastic one for about $5, then found it didn't fit into his lunch box, so I bought him a larger lunch box. Then I found out it is glass inside the plastic outer layers -- so if he were to drop his lunch box... I should have just bought the stainless to begin with, as it was I spent nearly the $15 making the $5 plastic work!!!
I pulled our glasses back out of storage and put the Tupperware in storage. I sold Tupperware for a few years in the mid-90s. I have sooo much and spent sooo much on the stuff. I haven't been able to ditch any of it yet. But I don't use most of it either...
My mother has been convinced plastic is bad since the mid-80s. Thank you mom... I just didn't take what she was saying into consideration when I sold Tupperware

My mother isn't perfect though she is totally freaking out about our Raw Milk!!!