Looking for advices on a good luggage bag(Italy aftermarket)

Hello fellow R3 owners.
Just got the Triumph luggage rack installed and I'm looking what bags/trunks the market has to offer and I'm a bit lost.

Would like to ask the more experienced owners which luggage bags they're using or/and what they recommend.

Currently considering the Iron Jia's Roller 40/60L OSAH Drybag, but would like to get a more "backpack" looking one for under 100€.
My idea is to have an easy to attach/detach bag to pack my work-pc setup(with some extra peripheral) + lunch. It can be a bigger one too, so I can repurpose it for travels with my partner.

Thank you and safe rides

I see nobody has replied, I'm watching this thread also. I just got my R3GT and it came with the OEM triumph bags, and I am so bummed they are barely too small for my hjc scorpion modular helmet. There's no way I can zip them with that helmet in there. Other bikes I've had had helmet locks on them but I can't find one anywhere on the R3GT.