Here’s a great FREE step-by-step tutorial on how to make an adjustable bag strap for bags or purses you have made yourself, or for adding adjustable straps to bags or purses you have purchased in stores etc. If you have lots of projects you want to work on then you will need a good supply of Swivel Clips and Strap Sliders.
This strap is made out of foam stabilizer (such as Flex Foam and Soft and Stable) and fabric, which allows you to match it to any print or design you want. You can also make one each out of a solid color such as grey, navy and black, knowing that you will have a bag strap available in your wardrobe to match any bag.
Here is the video tutorial on how to sew an adjustable bag strap. The video is courtesy of the whitneysews website.