CamelBak’s Hi Viz hydration pack features a compact Mil Spec 70 oz water reservoir, insulated tubing and padding, mouthpiece cover, quick shut-off valve, high visibility color scheme (safety orange or lime green), reflective strips, and a tear-away harness.
I have been using CamelBak products for years, and have had great experiences with their products. While I know they make a lot of products for military and tactical users, I didn’t know they made a high visibility pack.
It looks like the pack was thoughtfully designed. A bite valve cover means reduced likelihood of contamination by jobsite dust and debris, and a tear-away harness means you won’t be trapped if the pack gets caught on something.
It doesn’t seem like this small pack will get in the way of mobility or maneuverability at all.