The poly is way to thin, The mil. thickness is about half of other poly bags I have ordered online. The flap where the glue, (adhesive) is, the sealing strip is about 1/3 the height of other sealing strips. The flap does seem to stay sealed, but a bit more adhesive would be much more secure. All in all, I guess the bags are still pretty indestructible, but a thicker mil. poly would be more beneficial.