SLR housing with zoom lens

For your kind of application, we would recommend one of the following ewa-marine housings, depending on the size camera body you have and intend to use:

 

U-BZ

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ewa-marine U-BZ for large SLR cameras Canon 1D or 5D, 80D
Nikon D510 or D5
etc.

U-AZ

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ewa-marine U-AZ for smaller SLR and
large mirrorless cameras
Canon 750D, Canon Rebel range
Nikon D7200
Sony A7 (all versions)
Fuji X-T1 and X-T2
etc.

 

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If you want to use multiple bodies in the housing, please keep in mind, that you can always use a smaller boddy in a larger housing. But using a large body in a housing that we consider too small will likely lead to the housing failing some time in the future, even if it seems to work, with a squeeze, the first few times.
Using a smaller camera in a larger housing poses no risks, but will defenitely decrease ease of handling and ergonomics a bit.