Personally I think most brands of carry on luggage should hold 3 days worth of clothing and an extra pair of size 13 shoes. It's how you pack those clothes and shoes that make the difference. I recently packed for a 8 day 7 night trip in a carry on bag with the aid of packing cubes. The largest cube held all of my tops and bottoms while the other 2 cubes held everything else. I would suggest also packing your small intems, socks and underwear, rolled, and in a plastic sandwich bag, in your shoes. Hair brushes, combs, or small tolieties will also do well in your shoes. Save precious space where ever you can. Hope this helps.
