In regards to packing cels, I really dislike it 
when a person uses the "sticky" flap on the USPS 
box - with the cel either exposed to it, or the 
packing on the cel exposed to it. It might 
be "sealed", but during shipment the cel WILL and 
DOES shift into the sticky area. This tape is 
SOOOOO sticky, i've had to *carefully* pry cel 
bags/packaging from these areas before. One time 
I even had to cut the cel bag itself. :/ 
 Solution? Well, they supply packing tape. Using 
that on the outside of the box only seems to work 
juuuuust fine. Use enough and nothing will be 
falling through. In cases where I needed to use 
the sticky flap, I have just peeled the corners 
of the paper off, just so it sticks a little on 
the sides. Either works great. 
 *whew*.. I've wanted to say THAT for a long time!

/Tara