A lot of suggestions already for the 6400. That is my recommendation as well if you're going to do more than 2-3 days.I have an Exo 3500 that I love but was thinking about upgrading to the Exo 4800 with K3 frame; has anyone used both and is it worth the upgrade? I use it almost exclusively for backcountry elk hunts - 3 to 7 days. Thanks!!