The ads of this company called Airback that was making this backpacks where you could fit more stuff thanks to a built-in vacuum system appeared on my feed multiple times, but since the smallest bag they were making wasn't small enough to be used as free bag for lowcost companies I never really considered them. Now though I see there is a new model on their website called Airback Go that is made exactly for that purpose, and so I was wondering: does anyone here have actually tried it (or its bigger brother)? How is the quality of the backpacks? Is the vacuum thing something worth the price or it's more of a marketing strategy?