FYI: while the 70D is good and airtight (I made a sleeping mat out of it once), the 430D is not. The packcloth weave is encouragingly tough against scissors, but the coating is so thin that the edges fray. The weave shows through the coating. A quick welding test shows that the coating is not strong enough, and I cba making a seat cushion to test the airtightness considering that it fails the other tests. Not recommended.