I used a pringles container to cover my 75-300mm zoom lens. It was a loose fit but you can easily tape it down and it's not an issue at all except in high wind.
Just cut the tube down and then you cut out the inner part of the lid and from there you basically just clip a small sheet of solar film to the container like you would when you normally put the lid on.
I can't find the photo of it atm, if I do I'll post it.
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