The 6-pair SnowPack Extender gives you maximum capacity with the slide-out loading convenience. 6 skis or 4 boards, 16.5 lbs, glove-friendly, lockable. Same weight as the 4-pair Extender, so if you are already accepting the extending mechanism's weight penalty, you might as well get the larger size. Direct competitor to the standard SnowPack L — you are choosing between lighter weight or easier access.