During my trips I realized that there some gadgets without which you should never leave home. I am not a brand fan but I have strong reasons why I added the brand itself to some of the items, they do make a difference (I tried others before).
1. Osprey Farpoint 55 Travel Pack
It does not have an official carry on size, but if not overloaded you can pas with it at airlines that have hand-luggage + accessory. I had no issues on Iberia and Brussels Airlines. I have the S size. The way the back pack is made is very convenient (opening as a normal luggage) and the small backpack can be used on any trip as a perfect day-pack.