Sometimes I go hiking, and I want to travel w/1 body with lens attached. Let's so no bigger than the 12-35 or something like that. Anyone have any recommendations? I already have a Domke 5xb, so no need for messenger or sling bags. I mean literally something on a belt, so I can hold my dog's lead until we get to a free-roam area. It's just to keep my hands free while I walk. Thanks for any suggestions!