Necessary overkill.
GDU Canon RF Port Cap

You'll never want to put a plastic body cap on your camera ever again after seeing this new accessory from GDU. Built for the Canon RF mount, the RF Port Cap protects your sensor with a cover that is milled from a single block of 6061 aluminum. They've also added an assist lever made from a solid chunk of brass. Overkill or not, it's a pretty impressive piece of hardware and you'll always have peace of mind that your sensor is fully locked down and secure. 

$49, globaldynamicsunited.com

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