Bags that will always be "in"

most LV mono and epi in the classic shapes
chanel quilted bags in the squarish shapes
hermes obviously
YSL muse
kate spade nylon and boarskin bags for the most part
 
LV - mono, epi, damier
Dior - saddle bags and gauchos
Chanel - classic flap bags
Hermes - birkins and kellys
Mulberry - most styles
Marc Jacobs - Blake
Tod's - most styles
 
For me its the Spy. I saw it and loved it, and was looking for it in Topshop until I found out that it was from Fendi and it was an IT bag called the Spy! I'll always love my dark chocolate Spy. And I think it will always be IN.