"The Ergodyne low profile hydration pack keeps workers safely hydrated when they are away from water sources. Pack features a high-tech valve for handsfree drinking and a big mouth cap that fits faucets, hoses and even ice cubes. Closed cell insulation keeps water cooler for longer and a 2 liter bladder ensures ample water is always ready. The high-visibility lime shell and reflective materials ensure excellent visibility day and night. Great for fire/rescue/EMT, construction, freight/baggage, oil/gas refining, drilling/mining and landscaping/groundskeeping applications. Color Hi-Vis Lime, Capacity oz. 70. The 2 liter 70-oz. bladder holds enough liquid to keep you hydrated for up to 3 hours TPE polymer bladder for water that tastes like water, not plastic The MOFLOW bite valve lets you bite down and start the water flowing handsfree Big mouth opening for simple filling and cleaning Made with a 420D nylon shell to stand up to long term wear and tear Uses closed cell insulation to keep the water cold or warm for hours Zip-up cover keeps debris and contamination out Padded, adjustable straps for comfort 2-tone silver reflective chevrons for night visibility High-vis Lime for daytime visibility Neoprene tube wrap keeps liquid cool"