Looking for sling bag suggestion with lots of pockets in the 4-6L range

I'm looking for a new sling bag for work. Ideally something in the 4-6L range.

The main things I want are lots of pockets or slots for things like a multi tool, ear buds, pill case, wallet, and some pens with a couple to spare ideally.

A key leash would be nice too.

I'm hoping the extra space will be big enough to also fit a windbreaker or an empty yeti rambler.

The Alpaka 4L Flow satchel seems to mostly fit the requirements but I wish the outside pockets were reversed.