Inateck 17-20L Expandable Carry on Travel Laptop Backpack for Airline Approved, Splash-resistant 3-Way Cabin Luggage for Low-cost/Budget Airlines, Compatible with 14-Inch Laptops, Black

Keep in mind that Ryanair has over 3,000 daily flights, so it's difficult to predict what kind of baggage policy enforcement you might face for your specific flight. Personally, I try to stay within the rules, so I have a small travel backpack that easily meets Ryanair's personal item specs. I would think your Aer Go Pack 2 would be fine as a personal item (the Ryanair sizer length is actually 42 cm) unless you run into one of the new "no squish" baggage sizers. Regarding your Cotopaxi Allpa 35, it too should be fine, but again there are just too many variables to say definitively it will pass.