What kind of sturdiness are we talking about? Surviving being carried in a silk sportscoat pocket all day? Or, the back pocket of your dungarees while rolling down the side of a mountain?
If you must know, I was curious if there were something that could be better suited for wilderness camping or very long trips abroad. I'm nonetheless interested to see if modern pipemaking has yielded any notable alternatives to the above mentioned briar and meerschaum, though I would think the materials engineering aspect may be something to discuss with an artisan.
I'm not going to entertain notions of stress testing or gross misuse, however I do wonder if conventional pipes can withstand changing ambient temperatures (especially in freezing cold,) rattling around in a rucksack for long distances or sundry inconveniences encountered while traveling on foot. Thus far I've been thinking of a nice army mount pipe...