My SX was delivered with a Yamaha carry bag, i was very surprised,
It’s a heavy duty bag with good quality zippers,
This morning I cut some 6 mm plywood and pushed it in between the outer case and the sponge,
I cut some 12mm wall insulation around the edges,
I’ve used similar gig bags for years without any problems, very lightweight bag, easy to carry.
I have a ‘Gator’ hard case also but then it gets really heavy,
The bag in your LINK looks good.
Pino