This is a Camelbak Hydration Pack known as the Hi-Viz, model 1736801000.
When safety and visibility come first" the Hi-Viz is your answer. The Hi-Viz includes all the trusted features you've come to expect from CamelBak in two high visibility colors to keep you safe on the job. The externally accessed 2.5L" 85oz Mil Spec Crux Reservoir delivers 25% more water per sip and the tear-away harness keeps you safe even in the most critical situations.
Features:
High Visibility Orange
Tear-Away Harness Minimizes Snagging
Mesh Back Panel for Breathability and Comfort