PM Rear Lens Cap Canon EOS

Snaps on with a nice, firm click, so I never worry about it falling off in my bag. The inner surface feels smooth, and it definitely keeps the rear element clean between shoots.

Finally found a rear lens cap that actually clicks on securely instead of feeling loose. The fit on my Canon lenses is perfect and it keeps the dust out well.

I was worried about dust getting into my lenses when swapping them in the field, but this cap snaps on firmly and the plastic feels sturdy enough to last. It's a simple thing, but it really gives me peace of mind.