I moved out of state a few years ago. We were renting while house hunting so I had no idea how long my fabric would be in storage. I used medium sized moving boxes and marked all "Do not store on the ground." Our storage unit stayed dry but I wasn't taking chances. Since all the fabric boxes were kept off the floor I had no problems. If you are using a mover, ask them if they can put cardboard on the floor of your storage unit. It helps keep everything from being damaged. It was over a year before I unpacked my fabric, and it was in perfect condition.