The Osprey Daylite Backpack Attachment is ideal for minimalist missions, fast-paced hikes, and travel itineraries where lightweight carrying and minimal bulk is of utmost importance. It's an ingenious add-on to larger Osprey packs, specializing in carrying only the essentials when a larger pack is simply overkill. Hydration-compatibility means it'll accept an Osprey Hydraulics reservoir (not included) when you're walking long distances, ascending high altitudes, or dealing with hot climates. Spacer Mesh shoulder straps bolster the pack without soaking you in built-up perspiration on those steamy summer days. The pack's main compartment offers panel access for quickly grabbing and stashing items on the move. Inside the main area, the internal slip works to secure your hydration reservoir, doubling as a handy space for a small tablet. As a convenient bonus, there's a front organizer pocket with integrated clip for attaching keys and other necessities. For enhanced functionality, the Daylite attaches to the following Osprey packs: Aether/Ariel series, Volt/Viva series, Ace 75, Shuttle series, Sojourn Series, Farpoint 80, and Porter series.