Personal Hydration Systems (PHS) are authorized for wear as follows:

Personal Hydration Systems are considered PPE and are governed by PPE guidance.  A PHS is only authorized for wear with working uniforms and shall be black when used with the Operational Dress Uniform (ODU). When worn with other work and utility uniforms, the PHS shall match the pattern. In cases where a match is not available, the color shall be black.

Refer to the annotated Auxiliary Manual, Chapter 10 (Uniforms), Section C (Standards), new sub-section 10.C.3.t., Personal Hydration Systems, https://www.uscg.mil/auxiliary/publications/auxman.pdf

Reviewed and updated by DIR-U on 9 May 2017