I haven't found my ideal bag yet, but I have a pretty good idea what it should be like.
Vital characteristics:
- material: leather
- colour: black. I would be ok with grey snakeskin or some other subtle pattern, too.
- sturdy shoulder strap
- strong handles
- top zip
- big opening on top
- structured
- spacious but visually small on the outside
- big enough to fit an A4 paper, if needed. It should be able to hold a whole bunch of things and still have some space left.
- two compartments and a few strong smaller pockets (one for my phone, another one for the keys, the third one for tissues and a lip balm).
If we're talking about a really small bag to hold the bare essentials during travel, then my ideal bag would be a small, rather wide clutch with long, adjustable shoulder strap. Neutral colour, structured, classically elegant but not too dressy.
Big enough to hold a small wallet, a phone, tissues, glasses, a lip blam/lipstick and a pen.
Your three options are interesting, but in my opinion only the first one looks like an everyday type of bag. The YSL bags are of course beautiful, but because of their gold details and silver sparkle more appropriate for evening wear, special occasions or other times of fun and leisure.