As for lightweight luggage options - look for "IT Luggage" brand with softside walls. Sometimes they have sales online on Amazon, Kohls or Walmart. You can also find them at Marshalls and Ross. I and my wife have been using them for >12 years. They look like that they will fall apart but are suprisingly durable - we changed our carry-ons only once in 12 years.

P.S. You can get 22" spinner at Walmart for $60