To test it out I filled an old "holy sock" with catnip - as in, all the catnip in a single package, 14 grams or half an ounce in this case - and then wrapped the sock up and bound it with three elastic bands to keep it firmly in place.
Then I gave the sock to Victoria to see how she would react to it.
I think the video below speaks volumes by itself. Definitely a positive review from Victoria. Later I took the sock away and she spent some time laying in her favourite box and then sitting on the window sill watching the world go by. Since that kind of behaviour is normal it is hard to judge, but she seemed rather sedated and tired after all that exercise.
I am hoping filling an old sock with catnip will prevent her from stealing my other socks in the future. She has a tendency to collect them and carry them like kittens to her favourite mat.