Every bike commuter needs a makeup bag
I have several sets of bags and panniers I use depending on the weather and what I need to pack.

These bags are basically one large container which is what I prefer because my needs change on a daily basis.
This is my new favorite thing. It’s SMRITI Canvas Large Makeup Bag Pouch Purse Handbag Organizer with Zipper
My wife saw it and was like, “oh, a makeup bag”

But look at the stuff you can put in it!

I used to use a pencil case, but it’s too small

My small, every day carry items live in the makeup bag and I transfer this bag into whatever panniers or messenger bag I’m using on that day.