u/ivan510

What is everyone's favorite daypack?

I am a looking for a daypack bag between 15 and 20l and want to get some ideas. It will primarily be used when I travel somewhere to use around and carry souvenirs or whatever.
I heard the Aer Go Pack 2 is good, but I also heard its not the most comfortable for carrying few multiple hours at a time and it doesn't offer much back ventilation.