I have a strong, and perhaps unfair, aversion to backpacks that unzip completely down the side. They open fully, like clamshells, ... Thule Accent Daypack 28L. Rating: 8/10. $106 at Amazon.

Thule Aion 28L Travel Backpack. $160.89 FROM AMAZON. $189.95 FROM BACKCOUNTRY. $189.95 FROM THULE. If you enjoyed this story, be sure to follow Business Insider on MSN.