I have this backpack that fit my Ghost S1 with a large top hat perfectly, so it will be able to fit the T1 as well. It's kinda similar to the Black Ember Forge in the list. It also had room to fit my portable monitor, headphones, my mouse, my keyboard (65%), a mouse pad, and all the assorted cables I needed plus some portable chargers. I was also able to get through TSA and use it as a carry on just fine, even if it was just slightly bigger than what is considered a carry on.I did a little research on backpacks, because I also plan on moving the case occasionally.
As I don't own the case yet, I can't speak for it actually fitting.
But I tried to consider the aesthetics of the case and the sizes of the packs plus the possibility to add a little padding even.
You can find the links in the "link sheet by @threestripevida" under "possible carry solutions".
If anyone wants to add packs, feel free to hit me up.