I can't remember how many times I've said: "Now where did I put that blasted lens cap?!" Enter HACKxTACK. This kickstarter project tries to solve an age-old problem of photographers misplacing their lens caps amidst the excitement of shooting.
Another age-old solution to this problem is to tie your lens cap to a string like this:
But this doesn't appeal as much to me as the HACKxTACK.
If like me, you like their idea, consider supporting their kickstarter project here.
P.S.: this also makes a great gift for a friend or for that special photographer in your life.