All my bags but two are classic styles and I do this deliberately because I don't like the cycle of buy-sell-buy-sell. When I buy, it's with the intention of being in my collection forever and that I will wear forever even when I'm a little old lady (but I have parted with some bags that no longer fit my style).
Epi Alma bb, Noe bb, Speedy, Pochette metis, st Germain bb, Neverfull are the bags I consider my classics that will never go out of style.
My two non-classics are my Turenne pm and odeon pm. I definitely don't wear my Turenne anymore and haven't in a long time. It feels really dated when wearing it. It's sentimental though so it will be staying in my collection for now. I adore my odeon and will continue to wear it for as long as I love it regardless of current trends.