N no harm in keeping it attached
My advice would be to pick up a 5D4 or EOS R. You can’t go wrong with these choices and would also be future proof for few years
That’s the best you can get. Otherwise buy a small box and store in it
In today’s market you can get a used body like 5D mark III would be available for price of a new 77D, better to pick up a less used neat clean...
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