I’m a huge fan of the Ebag luggage collection. When I’m traveling, sometimes for months at a time, I bring this backpack, a carry-on bag and 1 checked bag. This one is essential. It holds my laptop, Ipad, snacks, cords you name it. And essentially, it has a water bottle holder on the side for easy access.
As mentioned in the Backpack description, I only take 3 pieces of luggage. This carry-on is the perfect size to stow away, and fits the carry-on criteria. I love the top access, and the division of space, so my shoes can be separate from my clothes etc.
This is the large size I use for checked luggage. You can go larger - to a 29” wheeled Duffel but I find this does the trick with the carry-on and the back pack. I can squeeze all my art supplies, as well as all weather gear in this travel system, without breaking the bank. Also, choose your fancy from a host of lovely colors.