First use / total loss

When I practice before its first use at the airport took the baggage carousel the backpack, the lowest longitudinal seam at the back was completely torn up and was no longer usable (at least for this trip). Fortunately, fell out only a small bag, otherwise the damage would have been much greater.
As is known, just not squeamish handled at the airport with luggage. But what else, as a trekking backpack, so treatment should actually best defy?