Please help me find a very small bag for DD15

[Looby4]

My DD would like a bag which is suitable for a 15 year old which just fits a phone, purse and oyster card. Has anyone seen anything that fits this bill. Needs to be black! TIA

I have this Whistles bag with a chain strap.

There's a version with a leather strap too.

Any of these small micro zatchels or bags?