The defining feature of the Aether 70 is the carrying harness. A lightwire peripheral frame effectively transfers loads to the Isoform 4 CM hip belt whilst a single aluminium centre stay maintains the Airscape backpanel shape to enhance airflow & breathability. Isoform shoulder harness & Isoform 4 CM hipbelt balance cushioning with support to provide an extremely comfortable yet stable carry. The Isoform hip belt can be removed & warn for 10 minutes allowing it to mould to your body. Further fit customisation is achieved by offering two sizes, each with further back length adjustment on the shoulder harness. So it is easy to get the perfect fit Osprey certainly know how to maximise storage options on their packs & the Aether is no exception, there are no fewer that 7 external pockets on this pack to make sure that whatever you bring along finds a home. The lid can be completely removed & features a webbing belt to turn it into a waist pack, a really handy feature when travelling. Access to the main compartment can be through the top or via the J zip which runs around the front of the pack, in a J shape, allowing quick & easy access to the contents. The main compartment can also be split to divide the load or keep wet dirty kit separate; the lower compartment can then be accessed through the wide mouth lower opening. Fully hydration compatible with a clever external bladder sleeve to make re-filling quick & easy so no more rooting around inside the pack to drag out your hydration bladder. Trekking poles are easily stowed without having to remove the pack thanks to the Stow-On-The-Go system, for me this brilliant system really sets Osprey packs apart from the competition. If the Aether 70 is just not big enough, or you need more versatile carrying options, you can attach a Daylite 13 pack to the front of the Aether using the Add-On loops. Air Scape backpanel with foam ridges for ventilation Sternum strap with emergency whistle Stretch mesh side pockets with Inside Out compression Top lid access Stretch front pocket Twin zippered hip belt pockets Stow-on-the-Go trekking pole attachment Twin ice axe loops Pre-curved Iso Form CM mouldable hipbelt Removable top lid, converts into lumbar pack Integrated & detachable raincover J-zip front panel access Straight Jacket compression Adjustable torso length Sleeping bag base compartment with internal divider Cord loop accessory attachment slots Daylite accessory compatible External hydration access Internal top load compression strap Removable sleeping pad straps Side compression straps Single aluminium stay