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It’s so lightweight with so much space for storage! This is perfect for trail running and long hikes on incline when you want to remain light. The extra pockets on the front and sides are perfect. Love everything about this pack. No chaffing either.
Great Ultra Pack - I've put every Zygos version to the test
The Zygos line has been my ultramarathon and general lightweight running pack for years. I still have my Zygos 1.0 and 2.0 and needed something with a bit more storage for my latest Nolan’s 14 attempt, but not as big as my Epic pack, which I use for the 20+ hour legs. The Zygos 4.0 was awesome. The waist and front pocket storage is meaningfully more that the 1.0 and 2.0 versions and it’s still super light and comfortable. I have a thing about stuffing too much into pockets and get frustrated trying to find various food items I want. Having the 4 pockets on the front help me organize and know where my various items are, so i can grab them efficiently. I like the slightly lower hose clip location on the left chest, compared to the other models. As with the Zygos 2.0, the ability to stash and retrieve z-poles without taking the pack off is appreciated. And, as with all UltAspire packs, I have NEVER had a material failure or other quality issue. I’ve had multiple friends with other brand packs have zippers fail and that’s just not acceptable during an ultramarathon, high alpine mountain adventure, or just a long run.
The main compartment is mesh, so has zero water resistance, unlike the 1.0 or 2.0. The capacity of the main compartment is not significantly more than the Zygos 1.0 or 2.0
So Far So Great
Excellent weight balance, front to back. Secure fit. Tons of pockets. Lots of space.
Sternum straps are thin elastic which sometime loosen. I'm also worried about their longevity, given the material.