Aer’s Travel Pack 2 though is very close to perfection for digital nomads who carry an office on their back and has become the main carry-on bag I use. The Travel Pack 2 has a good combination of large pocket with organization… almost. First, the main compartment is spacious at 34L but front-loading unlike the Thule Subterra’s open-top design. We can still put shoes in a bag and jam them into the Travel Pack 2 if needed. Robot as those compression straps look (I’ll admit they come in handy on occasion) they make opening the main compartment cumbersome.