Birkin 30, palladium hardware and croc Porous leather (my forever favourite - unique scales, keeps the shape very well and it it is very light). B30 is a perfect and tested size for me. B35 can get a bit heavy...B25 is too small for my frame and all dog supplies I carry with me at all times

Plus you cannot really swing it over your arm if you're not an XXS size person. But B30 is perfect (for me)! Lots of space, but not a lot of weight.
Back in the day when I was chained to my corporate office desk, I used black (and other neutral) bags a lot. Now I am all about the color. And this color (Vert Jade)? It is simply too delicious!

So much fun!
There are no lighting conditions under which it looks bad

It goes from looking great to greater!