It's a big zip that you can put a (thin) padlock -- or cable tie -- through the zipper "handles".
They used to do a sort of two-sided bag which is zipped together. Like that as dive kit is one side and clothes the other. Am certain that it's a bog-standard Chinese case they branded ND.
Main point with a drysuit is to ensure it's folded correctly and that there's no tight folds on the zipper. A bit of pedantry when folding is needed, then surround it with soft items.
