What is the best Louis Vuitton shoulder bag that is versatile (appropriate for night as well as day), a functional good size (big enough for everyday daytime use), LOOKS GOOD, not too young or teeny-bopper, e.t.c. So far, I've sort of narrowed it down to the Cabas Mezzo and Lockit Horizontal. Which one do you like better? I also like the Looping MM, but I've heard bad things about the special single shoulder strap hurting people. The Speedy 30 seems great- versatile for night/evening as well as day, a functional big enough size, looks good, BUT it doesn't have shoulder straps, so it is a definite no for me (I NEED shoulder straps). And if there's another LV shoulder bag that you could recommend, that would be great... thanks.