I agree with above. I just went to the hardware store and used a roll of gorilla tape when I got some airline damage. I thought the marketting and extra $2 was worth it to better than regular duck/duct tape. (Also if you ever have observed standard duck/duct used, you do see the adhesive and cloth start to rot after some time. It is common knowledge that you actually never should use duck/duct tape on actual ducts for this reason).
If you have small fingers or if your bag is unpadded, you can tape it from both sides, and it should be good to go.