Don't leave home without it.
I recently needed some gaffer's tape to throw in my camera bag. There are no good camera shops close to me, and I didn't have time for an hour's drive to get to one. So I checked out the local sports equipment store and grabbed a roll of black cloth hockey tape. $CDN 3.99 a roll. Way cheaper than gaffer's tape. Almost 100% lightproof. I put a single layer over the front of my 580EX flash and popped it full power. A few very tiny dots of light escaped.
I'm sure it's neither as strong or as sticky as the real thing, but then again I'm not securing studio lights or cables. I'm taping up little homemade gobos and snoots for off-camera hotshoe flash units. It's perfect.
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