I'm a pretty experienced mover. Moving nearly twenty times in my life, my go-to for sealing up my boxes was the clear packing tape that I would wrestle to attach to the tape dispenser and then end up cursing every time the tape stuck to itself or it would end up sticking to me. I would also end up doing two or three passes of the tape to make sure the box was good and sealed.
And then my life was changed. This last move my good friend told me about the packing tape from the U-Haul store. One strip of tape and you are good to go. No dispenser and it tears like a charm. It is sticky and strong enough to hold your heaviest belongings, including books and dishes. Yet, it doesn't stick to itself like the clear flimsy packing tape I've used for so many years. One roll taped an average of twenty boxes, top and bottom. Trust me, this is the best money you will spend in your next move!
Buy it here - UHaul Moving Supplies