I was also frustrated with this tape. Even though it says Shipping/Packaging tape, don't buy it (model 3450 tape) for paper or cardboard envelopes or boxes. It doesn't stay in place. It is very suitable to use on plastic packages. For boxes, use model 3650 tape (Long Lasting Storage Packing tape). The 3650 tape is much stickier and never falls off of boxes. My complaint to 3M is that they make many types of tape, and it's hard to tell which is suitable for which use. Even if you are just looking for packing tape.