I still think your fabric folds are a little distracting, I struggle with them all the time, but here's a bit of troubleshooting I hope helps you:
#1.- This is your fold on backpack 0.1.- In order for a fold like this to happen ( a compression fold) you need a force on top ( the fabric weight) and a force coming from the bottom ( the floor), I believe it looks unnatural because your bag is floating in mid air, so there is no corresponding bottom or top forces, a small memory fold could still appear if the fabric is stiff enough (see #3) or the bag is resting on the floor (#2)
#2.- The other issue in this and your other bags, is that your folds are too straight, deep and do not correspond, so they suggest inner structure which I am guessing is not your goal. Let me try to explain; when the top force crumples one corner, it usually crumples the opposite corner as well due to the force finding the least amount of resistance on the other corner, it is usually not symmetrical and occurs at a diagonal because of perpendicular forces, complex stuff. But our brain interprets a mismatch as something else, the missing fold on the bottom left of #2, or the misaligned one across and in front.
#3 To add to the confusion of folds, they sometimes appear without apparent forces (memory folds), or in different directions like vertically compressed,diagonally compressed. And finally (not shown) there are other types like tension and suspension folds, plus compound ones. If you must include folds in a hurry, I use a tablecloth stand in I copy folds from or a picture reference and also try to just suggest them rather than use full line weight.
#4 Or like Yo mentioned, you can omit most of them