Questions about Peak Design Travel Duffelpack 65L

Yes, even if you reach the limit in length. Already taken on a plane with no worries

I bought this bag, the difference is in the ergonomics. This has more elements for carrying on the back, the volume extension with closure (more compact if you don't use all the volume). https://www.mycloud.ch/l/L003DAD93C6AA34EA480FB0374416F3BB18A030F2CDB93B29536EB3C8C223C12E the volume is big enough to take the luggage of a hold suitcase and a cabin suitcase.