Dubman Mad_Cyril Nowt wrong with a decent duffle bag for short trips. Some even have wheels so you can mince along the street of London pulling it.
Hursty I like Osprey bags, although they may be too outdoorsy for the style you are going after https://www.ospreyeurope.com/shop/gb_en/travel-backpacks-luggage You can shop around for cheaper deals as they are pricey
