Carabiners, clips with "wide-gate" openings, which come in various sizes, shapes, and prices, are popular with mountain climbers and hikers. Photographers can use them too. I use two sizes on my camera bag: the smaller one to quickly attach my cell phone case; the larger on for a lens pouch. Walking my dog, I attach a carabiner to my belt and snap my dog's leash to it. This frees up my hands to snap a quick photo. You can find carabiners on the internet and in camping supply stores for $6-$10, but I paid just $1 each for a bunch at Home Depot.
—Reader Tip From James Tallon, Phoenix, AZ