A backpack It has multiple tapes that if we do not tie well it is very likely that they will get caught in the long journey of check in to the interior of the plane. If you do not compress the backpack well and tie the tapes correctly it is possible that when you arrive at your destination you will find yourself with an unpleasant surprise.
While I find this advice obvious, I think it is interesting to share it. As you can see in the image, before flying, I always compress the backpack by tying all the ribbons very tightly and the belts crossed in the reverse so that they do not escape and the backpack forms a solid and compact body.
On the other hand, I think it is interesting to comment that this same backpack is 55 + 10 liters and I have taken it on Ryanair flights by removing the racks as hand luggage and on no occasion have I had problems with excessive measurements.