In January 2017, the U.S. Consumer Product Safety Commission (CPSC) published a consumer product safety standard for sling carriers under section 104 of the Consumer Product Safety Improvement Act of 2008 (CPSIA). The standard incorporated by reference the ASTM voluntary standard that was in effect for sling carriers at the time, with an additional requirement for warning label attachment. ASTM has since revised the voluntary standard for sling carriers. The CPSIA provides a process for when a voluntary standards organization updates a standard that the Commission incorporated by reference in a section 104 rule. Consistent with that process, this direct final rule revises the mandatory standard for sling carriers to incorporate by reference the updated version of the ASTM standard, while retaining the additional requirement for warning label attachment.