I've finally found a bag which nicely fits almost everything I want to carry every day, and alos makes everything easily accessible - it is about the same size as what I used to carry, but now I no longer need to dump everything out to find what I neede, even with some lose parts still in there.
Contents:
Center:
4 empty 64 microSD with SD adapter
one rpi 2040 with USB-A interface
headphones
bag of female jumper cables, with male-male adapters
a collection of the most used NFC keyfobs
Left side:
USB-C cable with attached USB-A adapter (USB3, missing on picture)
two USB-C to headphone adapters
satechi USB-C power meter
headphone splitter
USB-C to SATA adapter
USB-C smartcart reader
VGA to HDMI
USB Ninja (USB-C)
proxmark3 with battery/bt
collection of NFC magic cards
Right side:
USB-C hub with charging port
miniDP to HDMI
small USB-C dock
USB-C to whatever adapters (mini, micro, B, HDMI, ..)