Having lost his Nikon 10.5mm lens cap, photographer Stu Carlson used the bottom end of a Dr. pepper bottle to cap his lens.
“The lens cap disappeared and I hate to have my lens unprotected. So I cut off the end of a Dr. Pepper bottle to use till I could order the right lens cap for it. Quite by accident I had picked a perfect fit for this lens and since a replacement cap is not cheap and this is and it works and fits so well, I have not bothered to order the replacement cap.
While the bottle seems to provide some nice protection, I doubt that the 10.5mm tastes as good as the original content of the bottle.