This is my favorite bag at the moment. It's from Stradivarius, I bought it about a month ago. So go check it out if it's still available (I think it should be).
Price: 45.95€ / $58.80 / £36.70
It's not big, but because of the shape you can put a lot of things in it. And I do carry a loooot of things in my bags. No matter how small they are, I somehow manage to squeeze so many things in there.
And one of my outfits with this bag:
Have an amazing day,