I am looking into buying lens pouches I can attach to my belt. I would like to use them to store my wide zoom and 24-70mm lens in them while shooting weddings. I would like to have the ones which are easy to access and open to change lens during wedding ceremonies, etc. when time is short. I know think tank sells some of them but I am wondering whether there are any under $20... I don't need fancy pouches. Can you recommend any?