Osprey Packs Syncro 15 Hydration Pack with Reservoir AirSpeed Suspension: A mesh backpanel supported by LightWire frame with side vents and horizontal carat ridge foam backing maintains comfortable fit and keeps your back cool. Blinker Light Attachment: An attachment point is provided for blinker lights. An integrated raincover is stored in a zippered compartment on every Syncro Series pack. Stretch the raincover over your Syncro Series pack to keep your gear dry during foul weather. NoScratch Top Slash Pocket: A quick access top zippered pocket is lined with a soft, easy to clean heat embossed fabric. Stretch Mesh Pockets: Stretch mesh pockets on both sides of the Syncro Pack provide extra storage and keep important gear easily accessible.