Quality is number one, plus size is important. For your backpack, try on different ones, each of you. If you plan to do a lot of walking with a backpack on, get one with a waist belt. Be sure the straps are comfy too. For luggage, get one with wheels, but be sure to not get it too big. Too big means over 50 lbs of stuff can go into it and that means more money when flying. Always weigh your luggage before leaving home too. I really like L.L.Bean luggage, They guarantee all their products. I have sent back 2 pieces of luggage after 6 months of use and they gave us brand new ones, no charge, except for shipping. They had faulty zippers.