Several years ago I went to a local bike shop, asked if they had any boxes I could use for travel. They said no but would save one for me, they asked type of bike and size. I told them a 59cm size, 700c touring bike. They called later and said they had a box for me, I went and picked up my box that was for a 59cm road bike. But, my touring bike had longer chainstays, did not fit in the box. I ended up taking my folding bike on that trip instead, as I did not need to haul panniers on that trip.
If you get a box at a bike shop, ask for the other packing materials too, such as the plastic part that goes in the front fork so that the fork blades do not puncture the bottom of the box and stick out, etc. Hmmmm, now in the age of through axles, not sure if the old plastic parts for that purpose are readily available any more. If not, you might need a 100mm piece of wood with a couple wood screws to go in your front fork.
I assume your bike is a Rohloff bike since you said Nomad, so I won't go into detail on rear derailleur or hanger.
There are packing videos on youtube. I attached two photos of how my road bike was packed by the manufacturer, I took these photos when I took it out of the box from the manufacturer.