A versatile two-in-one running pack featuring a 10-litre pocket that can be attached or removed depending on how much kit you wish to carry. The RACE ULTRA PRO 2in1 can be worn as a stripped-back race vest for shorter, faster runs or, with the 10L pocket attached, as a larger pack to carry all your kit on ultramarathons and longer training runs. It comes with 2 x 500ml Ultraflasks, so you can stay hydrated and comfortable no matter how hot or long the run, and a Speedcup (a re-usable water cup for races that require one as mandatory kit). The RACE ULTRA PRO 2in1 also includes a hanger so that you can comfortably fit a 2L bladder in the pack. Weighing in at just 345g without bottles and constructed from light and breathable materials, the pack is easy to adjust on the go, conforming to your body for a secure, bounce-free fit. Trusted by Damian Hall on the 171km UTMB, this versatile running pack with multiple storage options for bottles, poles and kit will see you through everything, from short training runs, ultra marathons and multi-day adventure races.S/M: Fit chest size 75-105cm / 29.5-41.3\" L/XL: Fit chest size 90-120cm / 35.4-47.2\"