I have recently ordered an NXe 13 elevation 4+3+2 an will be trying it on Thursday when it comes in. On ANS gear it says that it goes up to a size 52 or 54 can't remember which one.
They also sell belt extenders if you need even more room. My current size is 6'8 300 pounds and I'm roughly 24-25% body fat. (My other hobby is bodybuilding but I just started this year. Gotta start somewhere). I wear a size 38-40 jeans so we are close. Ill keep in touch.
I just received my pack and I will say that after trying it on and running around a bit, this pack is extremely comfortable and fits me with a ton of room to spare. You can tell from the quality of the pack that its very well built as will last. "These are all my opinions and are subject to change over my time with them". This is the first impression that I receive from the pack.
Overall. Guaranteed fit with no extender purchase necessary, looks good, very comfortable overall. Would purchase again. Here is the link to the pack.
Only con I see is the limited choice in colors.