There is no built-in whistle, which I've come to expect thanks to Osprey, and you need to buy the hydration bladder separately, but that's par for the course and not a dealbreaker with such an otherwise brilliant design
High-Frequency Sonar: Offers precise, detailed imaging in shallow to moderate depths
Perfect for festivals, raves, hikes, and beyond
The pack also features an additional front mesh pocket for added storage, trekking pole attachments, sleeping bag loops, and an easy to reach safety whistle
We recommend star-head self tapping screws for framing, most common sizes are 2-1/2", 1-3/4"
The shoulder straps are padded and comfortable, as in the cushioned back of the pack