Nikon LF-N1 Rear Lens Cap

The plastic feels sturdy enough, and the spring-loaded center mechanism clicks securely into place every time. I also appreciate that it's slim enough to not add much bulk when storing lenses in my bag.

Fits my 50mm lens perfectly and doesn't wobble at all—the inner rim grips just tight enough. I'd bought a generic cap before that kept falling off, and this one stays put even when I toss it in my bag.

Fits perfectly on all my lenses with the 24-70mm bayonet mount—clicks on securely and doesn't wobble. The plastic feels sturdy enough for tossing in a camera bag without worrying about the rear element. Exactly what I needed to keep dust off between shoots.