@Tipi
Keep in mind what I tell you now:
I own the normal sized version of the Snugpak Special Forces Sleep system, and the spare distance between my body height and the by Snugpak declared maximal user height is a bit smaller than you would have it in the XL version.
Sometimes, very rarely, I manage somehow to get a bit wrong into the sleep system and in this rare cases I would like to have another 3 cm spare length.
And you would have these additional 3 cm!
Would you have a normal or athletic body shape, the Snugpak Special Forces sleeping bag system would fit you perfectly.
As a former boy scout leader I collected used sleeping bags from military surplus shops and flea markets in Berlin and tried out them all. New once I got of course too during the last 45 years.
During the last years I also bought a lot of them new for colleagues, as we usually hang up posters for classical concerts all the year and everywhere. I usually force the colleagues to go with me to camping grounds for the nights, and I choose and buy the equipment for them. Also these sleeping bags I try out before I give them to the colleagues.
I surely slept in 40 or more different sleeping bag models through my life.
And the Snugpak Special Forces system is by far the best I ever owned and used.
I don't say, that the direct competition produces generally rubbish. I don't know all currently made high quality sleeping bags. And I don't want to tell you that you would necessarily need the Snugpak SF system. If your existing set up is fine for you, it is fine for you, that's all.
But if you should need a new sleep system I highly recommend to you to have a look at the olive green Snugpak Special Forces sleeping bags and the SF bivvy bag in the XL version.
You surely wouldn't regret the investment.