The ACTIV 12L Vest Pack has been developed for longer days on the trails. The 12 litre capacity will allow you to carry all your essential equipment for Ultra races, or just a big day out. Perfect for carrying your hydration out of the way and in comfort. Developed for use with a hydration system in the rear, which is easy to refill if needed. Also still compatible with our front hydration options. A new patented fitting system gives comfort and stability. Plus the ability to compress and stabilise the load in the pack from 12 to 2 litres.