The best thing about the Ciari Deluxe Carryall Backpack is it fits underneath an airline seat in front of you as your personal item. 

The Ciari Deluxe Carryall Backpack is a must-have for every traveling musician. It protects your Ascender guitar with its high-quality, durable construction and extra cushioning. Multiple compartments are thoughtfully designed to carry the Ciari Quilted Travel Bag (which comes free with every Ciari guitar purchase). Carry all your essentials such as a laptop, cables, headphones, or even a compact pedalboard or mini-amp in an easy-access front zip compartment. The backpack also has a zip expansion for an extra 4-inches of payload, and exterior compression straps to keep your gear stable.