At Amazon, get The North Face Borealis Convertible Pack for $56. That's $7 less than our mention from two weeks ago and the second-best deal we've seen for this backpack.
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Features 17.5-liter capacity Converts from a lumbar pack to a backpack with a stowable hip belt Water repellent, abrasion resistant nylon w/ reflective details Main compartment & 2 external pockets w/ zip closures Stretch mesh water bottle pocket & bungee compression system Measures 17.7" x 11.4" x 4.9" and weighs 1.2 lb.