How do you improve on an idea as simple as a rucksack raincover? After all, it's just a big shower-cap for your daysack. Well, this is Osprey, and Osprey always have a way to make it a bit better.
Daysacks are often used for commuting, on foot or by bike. So, first of all, make it bright yellow so it can be easily seen, then add reflective graphics and for a finishing touch, a bike light attachment point to really maximise visibility.
And, if you're taking your bag out into the hills rather than commuting, that extra visibility can come in very useful when the weather closes in.