3. Duluth Monarch Pack
If you had a strong back and were very, very lucky, you could fit Scarlett Johanson in the Monarch. It's made of heavy canvas and leather, and uses shoulder straps, a hip belt, and a tumpline, which you hardly see any more. And if you want a bigger belt or straps than standard, Duluth will put them on there. 6,970 cubic inches, and indestructible. $310; duluthpack.com.