Internal Frame vs. External Frame Packs – Appalachian Mountain Club
The Best External Frame Backpacks (And Why You Need One) – Greenbelly Meals
Scored this vintage Jansport k2 external frame pack for a backpacking/hitchhiking trip this summer. The guy who sold it to me told me he used to to backpack all over South America
External Frame Backpacks – Applying the Old Ways to the New Journeys (Part 3) - Carryology - Exploring better ways to carry