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Op, Zpacks has nigger tier quality control, is very overpriced and marketed at yuppies and boomers. You will be absolutely fine with a pack from the myriad of other cottage companies, such as Superior Wilderness Designs, LiteAf, Appalachian Packs etc, or if you’re a Yuro, GramXpert, Atom Packs etc.
If you don’t have your actual gear dialled down to a tiny weight do not bother. Do a mini thru hike first, then upgrade, otherwise you’ll end up ditching and upgrading so much of your gear that your Zpacks might be way too big and substantial and all you need is a 30L simple cuben sack