The Manta 28 has been discontinued. It was replaced by the Osprey Manta AG 28.
If you're looking for something new, check out the best hydration packs for 2020.
River Sports Outfitters says:
Features Built-in Raincover Dual Side Compression Straps ErgoPull(TM) Hipbelt Helmet Attachment Hydration System Panel Load Shove-it Pocket Stow-on-the-Go(TM) Stretch Mesh Side Pockets Top Slash Pocket Vertical Zippered Front Panel Zippered Hipbelt Pocket Specs Size Small/Medium: 26 Liters Medium/Large: 28 Liters WeightSmall/Medium: 2lb 1oz Medium/Large: 2lb 3oz Reservoir Small/Medium: 2lb 1oz Medium/Large: 2lb 3oz
Historic Range: $74.93-$150.00