Tex 30 is not the same as 30wt, so it may not be a thick thread.
Mara 70 is Tex 40; Mara 100 is Tex 30. So Mara 70 would be stronger. I found this thread (no pun intended!) that indicates Mara 70 is good for outdoor gear:
http://www.backpackinglight.com/cgi-...hread_id=47231
Also found this website that seems to list all the different Mara threads and their Tex numbers:
https://www.guetermann.com/shop/view...-Mara-Clothing