I had previously  purchased  the 20L pack some years ago and it is still  going  strong  despite traveling to New Zealand ,  Australia ,  and many ballparks  around the country .  I  had been using  a different 33L pack as my carry-on  for flights but those have not been  durable.  I  was very pleased to feel  the same light but strong  construction  in this pack  and believe it will last as long .  It's likely  that this bag will last  as long and at the price  it's  tough to beat.