Zpacks Nero Pro Backpack

The Zpacks Nero Pro is a 30-litre frameless backpack weighing 315 g, about 10.5 g per litre, built from Ultra TenX fabric rather than the Classic's Ultra 100X. It adds stretch-mesh front and side pockets for quick-reach items, features not specified on the Classic version, which is the main practical difference between the two. Like the Classic, it's rated for day hikes, multi-day trekking and thru-hiking, but Zpacks pitches it at more advanced hikers, presumably those who'll make use of the extra pocket organisation and the different fabric's characteristics on longer trips. The frameless build still means careful packing matters to keep the pack's shape against your back.