Bread subs other than tortillas

Have you considered using rice paper?  Its a little fragile.  No many calories, but it does a good job holdong thing together.   I know people don’t usually consider baking but Roti is another  quick bread to make on the trail.  My 2 cents.

Pumpernickel was a staple when I was going no-cook in the 1980s.  Compact, dense, minimal packaging.  Yeah, an entire piece doesn’t stay together, but the cracker-sized bits can be combined with cheese, salami, whatever and eaten just fine.

I won’t tell about a fellow Alaskan about Pilot Bread / biscuits, but for everyone else (who wasn’t a Boy Scout in the 1970s): they’re cheap, have no water weight, and travel well.  It’s a like a giant soda cracker the shape (and consistency) of a small Frisbee. 

Hard to find in many places, all the stores stock them here.