That one stays put together.

It works as a brooder, recovery cage for anyone with a boo boo, transport crate for processing, introduction cage and such.
If I were to have an ill bird....they would NOT get to use this one unless I were very very confident it was nothing contagious.
I had 2 of them but storing both was kind of a pain.
I also use the run pieces from my broody coop for many things. This does break down. Everything is bolts and wing nuts.
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Attached to he broody coop (made from scraps)
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The run alone sitting in the yard in November. I attached the old lid from the 2nd brooder/transport crate s a 4th side. River had used this as her safe puppy potty spot when tiny. Now my sons puppy is using it for her puppy potty/containment box.
Nope not letting a pup loose anywhere near my birds. Nope, nope, nope. Even though my birds are contained I don't want them spooked.
My tip for these things....make them consistent. All mine are 2' tall and either 4', 6', or 8' in length. It makes things versitile.