One of CamelBak's military lines features reservoirs that resist chemical and biological weapons; they are designed to be used with gas masks. The United States Army approved the use of CamelBak CBR X hydration packs in November 2015. The Army's office of the Product Manager-Soldier Clothing and Individual Equipment and the Army's Test and Evaluation Command approved the three-liter CBR X after exposing it to nerve agents for six hours, after thirty days of use in the field, and then verifying that the water inside remained uncontaminated, and, performing numerous other tests since 2006.