Hexweave Bag

assuming that [Hexweave Cloth] is on a daily cooldown, it would take you about 10 days to create this. while the [Royal Satchel] takes 12 days.
as Nynaeve said, the [Sorcerous Earth] is probably aquired randomly during professions.
this is currently all speculation right now.

If the recipe stays the same as it currently is on beta:

At 20 Sumptuous Fur and 10 Gorgrond Flytrap per [item=111556], 100 [item=111556] will require the following mats:

250 Sumptuous Fur
125 [item=111556]

One of the spells to create Hexweave Cloth now creates 4 per use, and another, Hexweave Cloth produces 10. The preceding maths were calculated using the former spell, so if you make it with the latter, you will need fewer.

Your 10 Sorcerous Earth will be obtained as a "crafting byproduct" so it's likely to be somewhat RNG-based.

We're in BFA times, and this is still an excellent bag to make.
Legion brought us a different 30 slotter (that for some strange reason, sells consistently for more gold on the AH).
BFA has brought us.... a 32 slot bag, with ridiculous requirements to build!
So, this bag is still an excellent choice.

Sorcerous Earth can be acquired for practically nothing (if you're a tailor, save all the air/water you get from daily hexweave transmutes and get an alchemist to turn them into earth for you).

So, the cost of each bag is around the cost of 100 Sumptuous Fur.
Sumptuous Fur no longer costs 4g each, but as long as 100 of them cost less than one of these bags - then it's still worth it to make these things yourself.

As of today, 1xSumptuous Fur = 15g and the bag costs 2500g - so it's around 1000g saving to keep doing the daily hexweave transmute for me.