I have repaired leather with sewing. It is difficult but the holes are already punched for you so you can just push the needle through the same holes unless the leather is ripped. I have also glued but I prefer sewing if it is at all possible because that will restore it to the way it was originally.I have 2 bags. The one I think just needs conditioned. The other is kind of a mess. It has a lot of color loss and the stitching came out where the strap meets the bag.
My question is, should I just do the acrylic mixed with conditioner trick?
Also for the straps the have come loose, I'm just wondering if I should glue them in place. I asked an experienced seamstress and she said its hard to sew leather.
Here is a pic of the bags
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Daypack with lots of wear
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For the color loss, the paint with conditioner might work. You can't use too much paint or it will change the texture of the leather so if a small amount doesn't work, you might have to use dye. Conditioner by itself will darken it some so the paint/conditioner mix might be enough.