I think the logic here is supposed to be something like:

more knowledge = more complex brain

as you need to “store” the knowledge somewhere.

I don’t say thats how it works but i can somehow see where OP is coming from.

Sister 1 is #7, nothing she wont gobble down Sister 2 is #8, her true form is liquid to the point you wont understand even how

You could try to find someone to taylor something like this for you. It will be pricey but you’ll have the most control about fit and material.

Im using that one since 2021 for at least one heavy shopping trip per week and am pleased with it so far. Still is in very good condition and will hopefully be for many years to come.

If the meister ever breaks i will treat myself to one of those. They are always in the top in rankings and can tolerate loads of weight.

Spare parts are available for both so repairability is alsp no problem

Not sure if these are available were ever you live. :)

We stopped preparing/bringing the food whenever they started getting annoying and only continued as they went silent again. First 2 times took some time, after that they learned pretty quickly that silence gets the belly full quicker. This obviously only works with regular and sufficiently fed cats. As soon as one of ours needed to go on a brief diet (stomach flu) they started to get very vocal very fast and did only turn down their volume weeks after getting fed normally again. I think shes still salty about it months later… :(

Please look after your cat carefully for the next few days. My vet said they can get the big C too.