I have saved a fortune on carabiners since I started making soft shackles from paracord. This particular use was hanging backpacks on a luggage cart at a hotel. Both are secured in place by tension on the stopper knot.
This is an example of a whipping knot. Not a great example because I forgot to secure it, and also I forgot the finishing square knot.
For quick deploys with stable tension, I don’t need to lock the soft shackle. If I was attaching the shackle where it would bounce around, then it would need a lock.