It would be great if The Chronicle had a travel product “test kitchen” for putting all our gear and gadgets through the paces, but instead we just take them on the road. The clam-shell design (including a zippered mesh to keep shirts flat) makes it easy to fill and, unlike a lot of soft-sided carry-on backpacks, the Air will definitely fit in the bag-sizer at the gate (without using the expansion zipper, of course).