External frames are no longer fashionable, but they are still unexcelled for bulky, awkward loads. I used a Kelty external frame for years until it was eventually stolen - one of the best packs I have ever carried.

Today, there are many good brands available like Mystery Ranch - I like Mountainsmith and REI. Osprey has a good reputation, along with many others. It is good that there are many good quality back packs available - really fundamental outdoor gear.
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Geezer in Chief