Check the repair strength by pulling an unbroken strap gently, and then pulling the repaired strap in the same way.

When pulling the repaired strap, if it looks weak or strained, repeat step 4 again and add some additional stitching on the sewing machine (yellow arrow).

Turn the bag back the correct way, and stuff the sleeping bag back in. If it looks unstrained and strong, you're ready to go!

Note: it is normal for the repaired strap to be 5-10mm shorter after the repair, and this may be noticeable when the bag is packed.