So I made a video talking about my latest pack. It's right here:
For those who don't recall the thread on it a few months ago, this is a big frameless pack I made for packrafting, backcountry skiing, winter hiking, and trips that combine all three. It takes all I've learned making packs over the last 18 months (http://www.backpackinglight.com/cgi-bin/backpackinglight/forums/thread_display.html?forum_thread_id=20430) and consolidates it nicely.
The pack carries so well that I'll probably be using it cinched down for trips that other, smaller pack would work for.
The side/back pockets are what I'm most proud of. It took me a bit of brainstorming (over months) to think of a design that would fold mostly flat if not in use, hold a lot, and be accessible without taking the pack off or crazy arm contortions. I was having particular trouble thinking of how compression would work without interfering.
The video doesn't dwell on it, but there is a lower compression strap that runs all the way around the bottom of the pack. The buckles sit an inch below and inside the top of the side pockets, and slits in the side/back pocket interface allow the strap to run either outside or inside the back pocket. It is also removeable.
The overall design is obviously my own, but was inspired by ULA side pockets, the BPL Absaroka, and the REI UL 60 design. It's proven to be really useful, and I'd encourage others to copy and modify it.
I'll answer all question, but am moving tomorrow so responses won't be prompt.