I am a huge fan of Gregory backpacks, with the Zulu 65 being an addition to my Baltoro 75. I bought the Zulu 65 last year and have used it about 400 miles on the PCT and a few other very small trips. By far this is the most comfortable pack I have owned to date. Overall, I like the features, especially the hipbelt pockets which fit my phone (small iPhone) perfectly and other miscellaneous items, like my Spot and pocket knife. The side pockets, made of stretchy material, are perfect for easily slipping water bottles in and out. The mesh back panel, is a bit slippery, but is comfortable and it keeps your back cool. Another reviewer said the backpack did not come with a rain cover, but mine did. My only complaint, is that after a few hundred miles of use, is that the hipbelt seams are starting to tear at the bottom (unfortunately I could not add pics to this review). I have never overloaded this pack, thus I am quite surprised at the weak sewing job. I had planned on using this pack to complete the PCT this year, however, I do not trust this pack to make it to the finish line.
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