Since a few years I use big Curver-boxes as a terrarium to rear young snakes. I also use them as quarantine terrariums to let gravid specimen give birth to their young and also for snakes that need a bit more attention and rest for a while.
I mainly use the 70-liter variant (60 x 40 x40 cm).
There is also a larger box available (70 x 40 x 45 cm).

I bought most of the boxes I use in the Curverwebshop, but you can buy them in most DIY shops too.

These boxes are very convenient to use. They are easy to clean and if you’re not using them, you can stack them in each other and then they take up very little space.
Also, they are transparent (not as clear as glass) so you can see just fine what is happening inside the box. When cleaning do not use hard brush, otherwise you get little scratches in the plastic making it less transparent.
Until recently, I did nothing else than sawing a few holes in the lid with a hole saw, paste a piece of gauze in front of the holes, mount a fitting in it and ready for use it is.
But… once the snakes realize there is an escape route once you take the lid off, it gets tricky. When the snakes are still small than there is no problem. But when they reach a length of about 30-35 cm, its becomes dangerous. They try to escape as soon as you take the lid of or when you have the water bowl in one hand and in the other the lid. And in my case, where the terrariums are standing on our attic where also a lot of other stuff is standing, you do not want them to get out of the box. And once they succeed in their attempt to get out of the box, they keep on trying this. Also, afterwards I found that only ventilation in the lid was insufficient.

I have created a variant whereby the lid no longer needs to be taken off  and you can still work in the box. There also is more ventilation now.
I will explain through pictures and text how I made it.

Starting point was that it should not be expensive, I had te be able to make it (I’m not really a handyman) and that such a terrarium has to be efficient in use.