The Product
In this particular case it is the Canon RF-4 housing cover for the EOS series. It is set on the camera body when the lens is removed. For just under 4 euros I bought it on Amazon. If you are traveling, it is better to transport the lens and body individually, since the structure is otherwise very bulky.
My Opinion
When unpacking the lid, I realized that here Canon quality is present. No annoying plastic smell, no loose parts, only a stable looking, black cover with Canon logo.
Of course, I immediately grabbed my camera and tried the good piece. It fit right away! To simulate transport situations, I pushed around a bit on the cover if to see if he would be solved. But he did not. It was hardly possible to move the lid just a bit, so that dirt or dust could get inside.
The removal of the lid works well, however, one must not think that this process using heavy tools would have to go to the camera.
After about six months of testing, I'm still very happy with the lid. He has accompanied me on many trips and never fails his service. Nothing is broken, all the "knobs" are still there, and it protects my camera very well. Also in the camera bag I take the lens off sometimes, it works wonderfully namely with the lid.
Conclusion
I can every Canon users recommend this cover. For a small price, it protects the camera from dust and outstanding he keeps making sure. He also looks quite chic with the Canon logo. There are 5 of 5 stars from me.