Uline Thick Packing Tape, 3.5 mil Thick, 2" x 55 Yd, Crystal Clear, 6 Rolls (S-447) The Strongest tape Uline sells. Great for oversize shipments and packages over 60 lbs. 3.5 Mil thick which means it has the strength to make sure your boxes won't break open or come apart. Strong bonding to packages so you don't need to worry about the tape coming off.