I have always found that if I have empty space I will find something that I can fill it with...nature abhors a vacuum. When I only going to be out for a short trip I have found a fishing shirt with a couple of chest buttoned pockets is all I need or even try one of lanyards that are on the market. For longer trips I have gone to an LLBean chest pack that I use as a fanny pack. I like this one since it has enough room for a sandwich and a bottle of water with plenty of room left over. Vests are just too hot in the summer walking in to the backcountry.