There are some confusing terms and names for seams with lots of crossover, it can be hard to navigate.
Although very very nerdy, there is a system for describing seams. Here's one lifted from the
Coats Website;
Water under the bridge, no harm done and yes...a good discussion.
@craige.....the bottom pic is a Mariposa gen 3. It's been babied but seen a lot of days out, probably been around the world at least once. Pic of the bottom, and the cover Grosgrain for the straps/lycra. The red pack has done many hundreds too. I'm probably out about 80 nights a year on average, on 60 for this year already.
VX for straps; ...I made some straps from VX07 which were a similar shape to Palante...wider at the attachment point than the strap. They started failing quickly. 5 days into a trip and the threads on each side were pulling out. The fabric was starting to tear. They got cut off and replaced with the below type.
The lack of elasticty in X-pac with it's bias controlling grid and film means it doesn't have much elasticity and pulls on the end threads quite badly. I started to carry the mesh round the strap sides and 10mm at least at the front to remove the facing material from the strap . 10mm seam allowance and a dasiy chain mean that the weakest part is the double thickness fabric. The spacer mesh carries the most force, the daisy chain most of the rest. I can rip most VX's by hand, 300-400 gsm spacer mesh laughs at my efforts.
Here's a VX07 (soft) strap and body that I've been using to test out some new features and construction , regularly carrying 14-17kg, heaviest load of 25kg a few times with summit camping water or winter kit and it hasn't seen a load of less than 12kg. It was the first pack I made with this type of strap and it's held up better than double full width fabric and spacer mesh.
This is after 50-60 days of use
There isn't a hit of thread pulling on either side, it's made a huge difference.
FWIW, I'm now using cheaper and lighter fabric for straps now too. Straps have a lot of cutting wastage, and throwing a good %age of expensive laminate in the scraps bin is becoming too much.