True, but then you’ve only got like three different sizes possible, because you can only change the depth. There are not going to be a ton of glass options that fit this description because glass containers that stack like this tend to get stuck and can break so much more easily. That’s why it’s easier to find plastic containers that work like this. It’s even a problem with restaurant grade pint glasses which are nearly indestructible. Ever had a stack of those little devils decide they are better together? Such a pain to get them apart. Next time you’re at a bar notice the pint glasses. Most places won’t store them stacked because as the cool after being put away warmer from washing they have a tendency to get stuck. It happens with Pyrex measuring cups too. Plastic can be wrenched apart. Glass can be too, but sometimes it makes big giant mess. Stacking glass containers that are all the same size inside of each other makes them significantly more susceptible to shattering as the expansion and contraction with the temp change as well as the extra tight banging around is just not a great mix and makes stuff break so much quicker.

I have seen some glass that has silicone on the outside which would help a ton, but those seem to be bested still. Maybe some company out there makes stacking ones? That could be a possibility. I just haven’t found any.

Because if they all have the same size lid one cannot physically fit inside of the other to be nested.

What Rubbermaid containers are you talking about. Will you post a link/ picture?

You’re not going to find too many things that fit this description because you wouldn’t be able to nest the containers in the cabinet when empty. If every container used the same size lid, when empty they would still take up a ton of storage space.

You’re best best will be mason jars or Fido glass storage jars. Very few people are going to buy 10 bowls/ container than have to be stored individually next to each other and can’t be nested when empty. It’s a huge waste of cabinet space.

Pillows are not buy it for life. They need to be replaced every couple of years, at least.