Open the unfolded view and the calculator prices this bag in a mountain of cloth and a Level 3 bench. Don't read that as a farming target. Most of the cloth stands in for the rope inside the kits, and no bench crafts rope. If you sew the kits yourself, the bag really costs fifteen coils from barrels, crates and the recycler.
Every player knows the recipe from the start, so scrap never enters the decision. Kits do. The same five could sew a bed and a road sign kilt with one to spare, and early in a wipe a respawn point and armour usually beat extra slots on a road loop.
So craft it at the Level 1 workbench once the armour is sorted, not before.
Questions
Small Backpack ×10: how many resources?
Cloth ×500, Sewing Kit ×50.
Which workbench does Small Backpack need?
Workbench level 1.
How long does Small Backpack take to craft?
15 s for one, every step included.
How much scrap does researching Small Backpack take?