PM 55mm Professional Lens Cap

The grip-and-squeeze mechanism is so much more secure than the push-on style I used before. Snaps on firmly and stays put even when I toss the lens in my bag.

I was tired of lens caps that fall off mid-shot, but this one's squeeze-to-compress design actually stays put. The inner grip makes it easy to remove even with a filter attached, and it's protected my glass from a few accidental bumps already.

Finally, a lens cap that actually stays on my 55mm lens without popping off every time I pull the camera out of my bag. The squeeze-to-release mechanism is so much easier than prying at the edges, especially when I have a filter attached.