Another problem is that when you find a pack you really, really like and you need a replacement it is generally not available a few years/decade later. This also it seems applies to other things such as boots.
Colin Fletcher referred to that as Herblock's Law: "If it's good, they'll stopped making it". This can be countered with Gerhardt’s Law: "If you find something you like buy a lifetime supply - they’re going to stop making it".
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