Question about Kolink Satellite

Hello Martin. I still have this enclosure in use and can tell you that although everything fits, it is not ideal. The case is made for ATX power supplies, without an adapter the SFX power supply hangs crooked on only one screw. With the SFX PSU you have plenty of space for the graphics card and can use the entire length of the case. With an ATX power supply it quickly becomes very tight to impossible to get the graphics card past the power supply cable. In addition, the warm air from the PSU does not go directly outside because the PSU is not flush with the case. Together with only one 120mm fan, that's not so great. I would recommend the also small and cheap Sharkoon QB One case. It seems to cool better (not just one fan) and is otherwise better designed.
Furthermore, I would consider the following in your place:
-Change to the MSI B450 ITX board, should be a bit higher quality.
-240GB SSD costs slightly more, but offers more space for the system and a handful of favourite games. 120GB fills up very quickly and you always need 20-30GB for system and game updates.
IMPORTANT: With all non-570X boards, the BIOS must be updated first, otherwise the Zen 2 CPUS (Ryzen 3XXX) will not run. The Asrock and the MSI MB cannot be updated via USB. This means you need a ryzen 1XXX/2XXX Cpu for the update.

The bios update is mandatory, you can google it. The Kolink has more volume than the QB One, so it is bigger. In my opinion, the QB One should also fit better in a backpack because it is less high, whereas the Kolink is quite "blocky". Personally, I use the Raven RVZ01 and the Node 202, both of which fit well in a carry bag. They are probably too bulky for a backpack. I don't know of any other case in this price category that meets your requirements.

Thanks for the answer. For me, the goal was a small, cheap housing where everything fits in. I will think about the cooling solution. I'll probably grind the case and put in a small cooling unit. Thanks for the suggestion with the Sharkoon case, but it's a bit too big for me.

As far as the components are concerned, they were specially tuned by me. I don't need a better board because it has WiFi (for on the road with a hotspot) and enough transistors. I looked at the compatibility between board, CPU and Ram on the internet and they all fit. A bios update can be done quickly and is not absolutely necessary. As far as I can remember, this was the case with the older mainboard models where Ryzen 2000s didn't run on it.
I'm only buying 120GB storage for Windows, as I have an external SSD 500gb with 900 mbit write/read at home and my games and all my work will run on it.
Do you know of any other small enclosures that are portable and cheap? It just has to fit in my backpack. No bigger than a PS4 Slim.