I "roll my own" duct tape for my kits. I take the cardboard tube from a pants hanger you get from the dry cleaning place. I start the duct tape on the tube and then unroll about 3' of duct tape but leave it attached to the original roll of tape. I hold the hanger tube about shoulder height and roll the 3' on to the hanger tube. I peel off an additional 3' from the still attached store bought roll and feed onto my hanger tube. I do this until I have 12' of duct tape on my tube. I found this a way to know the appoximate amount of tape I am carrying. 12' of duct tape around a hanger tube is about 1.25" in diameter.

Then I use a saw and cut the hanger tube close to the sides of my new mini roll of duct tape. You can store a golf pencil in the hanger tube. A sparklite would also fit instead. For some reason I tend to make several kits at a time so I ususally make several mini rolls at one time and use up most of a hanger tube.