Is this backpack with a built-in vacuum system the key to avoiding baggage fees?
Briefly

The Airback backpack's vacuum-sealed section claims to increase capacity by 50%, helping travelers maximize their under-seat cabin bag's usage and save on baggage fees.
It's a really comfy bag to wear, and I love that there are so many well-thought-out compartments... I struggled to zip it up with all my clothes before sucking the air out.
The bag feels robust and good quality, with dedicated sections for a laptop, water bottle, and travel accessories, plus a USB/C charging port for convenience.
Although the Airback allows for more packing efficiency, its vacuum pack compartment could be larger to enhance effectiveness for travelers who tend to overpack.
Read at CN Traveller
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