This is the ideal bag to defend your expensive rucksack from the baggage handlers! It probably wouldn't manage a large, heavy rucksack but it has survived three flights with my 43l rucksack now and both look like new. It's not massively strong material but then, if it was, it would be too heavy to carry around all the time. As far as I'm concerned it's paid for itself already. If it does split next time I'll happily buy another one.