I’ve heard about Zpacks through youtube, and through a norwegian forum for hikers. I’m only familiar with one brand that’s geographically closer – Sarek Gear (Sweden). But there seem to be limited reviews online of their products, at least compared to Zpacks. In my view, it’s safer to buy gear that have gone through a lot of reviews – at least when it’s impossible to test before I buy.
Legally, it’s preferable to buy from a retailer in Norway as the law provides a 5 year guarantee if the product is meant to last at least 3-4 years. So the limited warranty on products from the US, is not very attractive. However, it’s not that easy to find ultralight gear here.
I am not sure if it’s much of a difference between conditions in Norway compared to conditions one meets at the PCT/AT/CDT. Not any desert here, and somewhat colder overall, maybe. But hiking up and down the mountains here can really break a sweat, and the trampoline-system from Zpacks seems very interesting with that in mind.
I have another backpack for winter-use (skiing), the HMG Southwest 4400. But due to upper back-problems, I have to try to reduce weight, or limit the length of my hikes.
But I am open for suggestions for other backpacks.