The manufacturer of the Nuvan ProStrips advises against cutting the strips. We recommend that you do not overly pack bags/containers/totes too full with belongings so that the vapors can work around the items effectively. The bags can use a strip but must be tied to enclose the strip for effectiveness. You can apply a strip one per 100-200 cubic feet of space for 2 weeks to 4 months depending on the targeted pest.
Nuvan ProStrips are labeled to be effective from 2 weeks to 4 months in a closet for insect control. They are labeled for moths not specifically clothes moths. You want to allow the vapors in an enclosed area to build up to a level that will be lethal to the insects that your are trying to eliminate. Opening and closing the doors to these enclosed spaces may result in poor efficacy. It is best to make sure things are loosely packed into the areas to insure that the vapors can adequately circulate through the items that need to be treated. You may contact the manufacturer for more information at 888.462.6822. For treatment of Cloths Moths, please click on the article link below for more detailed information on treatment and product recommendations
http://www.domyownpestcontrol.com/how-to-get-rid-of-clothes-moths-a-427.html