A month? More like 35 years. That's how long ago some of those lids were actually made. I hated washing those fuckin things, with their shitty ass ripple design getting food all stuck up in there.
They are 35 years model, with a measurable age of 35 years. But the researchers actually got brand new products, of current models from the store yesterday.
Bro I grew up with a cabinet just like that, cleaning those lids was a nightmare, but now all my lids end up cracked/broken. I'm losing the battle of the Tupperware wars!!
After years of thought I have come to the conclusion that the only sane way to store tupperware is with each container attached to its lid, everything stacked. I know you end up having room for like half the tupperware that way but I think it's the only way.