Hi there. I was struggling too between bb and petit. At the end i went for petit - why? Because bb would be too small for my flight weekend trips. I'm an easy person and like to travel with my handbag only (no other bags whatsoever). I used my speedy 30, givenchy antigona and now petit noe. What fits inside? A lot:
- 2 t-shirts, underwear
- hair dryer travel size
- plastic bag with liquids (shampoo, tooth brush, razor, tooth paste, perfume etc)
- make up bag - size s (i use kiko sheer squared bag, sold 2pack in 2 sizes)
- tangle teezer, normal size
- 0.33 bottle of water
- mini pochette (use it as a wallet)
- keys, phone
- another small pochette with wires, headphones etc.
- small umbrella
- a bretzel
On the way back i could even fit "colomba" (1kg italian easter cake) inside my bag. 1/3 was outside but i still could carry the bag on my shoulders.
The bb is nice too but its in my opinion only for summer and only for essentials. If its what you want go for it. There should be a price increase in some weeks. At least in europe.