Have had excellent results with Scotch 3850 Premium Performance clear tape, available from Staples. It's heavy, strong, and sticks well. It costs a bit more than the generic stuff, but what we ship is well worth it.
Seeking packing tape recommendations
I aspire to pack the used gear I ship as well as or better than the original manufacture. I'm not happy with the quality of packing tape I can get at Office Depot and whatnot, even their so-called "heavy duty" flavors. It seems flimsy to me. There's a whole world of packing tapes out there (and specialty websites for just that), but I'd prefer not to buy 36 rolls at a time. But if I do have to buy that much to get the good stuff, I want to make sure I'm getting the =really good= stuff (for my application -- I'm not trying to pack a submarine, after all). If there are any packing tape connoisseurs out there, what do like and where do you get it?