It's this simple! Use a carabina then you can unclip/clip one handed or take rucksack off and flip caldwell over onto it for extra height. This is North Face bag and works with rifle as well as Camelbak units. If you get sick of caldwell bumping your arse then flip it up and hold with the rucksacks bungee cord.It's still easy to deploy one handed with rucksack on.