Outer pockets you can add to your luggage. No word on if you can attach the smaller pockets to the larger pockets.
Waterproof bags for your cumbersome walkie-talkies that you will probably use one time, at a campsite, to call your pals and ask for them to bring you toilet paper.
"Snack Pack" bags - basically a waterproof bag, but it comes with a strap, so when you're REALLY hungry you can hang it around your neck and grab trail mix with both hands. Yes, that's how they describe it, too: You can hang it around your neck.