An XLAB Delta 425 securely holds a rear hydration system, though Kessler is using this mount to store here spares and repair kit in an XLAB Cage Pod. A top tube mounted XLAB Stealth Pocket allows for easy access to nutrition during the Ironman’s 112-mile bike leg.
Read more at http://www.triathlete.com/2016/10/ironman/pro-bike-meredith-kesslers-ventum-one_294260#lfGUdCurWTOmIZeY.99