by Nathan C » Sun Feb 16, 2014 5:44 am
The 6300 is taller and has a larger circumference than the 4800.
Size wise the 3900 is similar to a 65L dry bag, the 4800 will swallow a 65L dry bag with room to spare, and the 6300 is just massive.
Extra cubic inches in the pack bag doesn't come at much of a penalty though. The bags are the same price currently, and you only gain an ounce or two in weight. The Talons do such a good job of compressing the bags that even empty the bags are stowed away tightly.