I bought this because my original Trekker ST, purchased in 2011, is so wonderful! I've noticed that Kelty is making fewer and fewer external frame packs; in fact the Trekker is the only full size backpack they are still selling. And they have all three of the external frame packs they are currently making significantly discounted at this time. I'm worried that in future years, it may be impossible to buy one. The old one has stood up so well to many years of hard use that I imagine this new one will see me through the rest of my backpacking days.
I carry an external frame pack because I have two spine issues - spondylosis in my cervical spine, and a possible finicky disc in my lower lumbar spine. I cannot carry internal frame packs, because the bottom of these packs sits and puts pressure on the lowest part of my spine, below where the spine fuses with the pelvis, which gives me a very sore lower back. No matter how light my pack is, if it puts weight down here, I can't carry it. Internal frame packs also tend to pull backwards and downwards on the shoulders, putting weight on top of the trapezius muscles which causes pain in my dodgy neck. The External frame puts the weight high and transfers the load to my pelvis and legs without irritating these two problem areas. I can adjust it so that there is zero weight on my shoulders, if I want to. I'm a Grade 1 trail walker, so instability while scrambling is not a problem for me. It's a bit hard to find raincovers for these pack...
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