The Atlas Bladder System was designed to allow you to carry up to a 3 L bladder while hiking with the Atlas Trainer. Its function doesn't stop there though. You can also use it with the Butte 25 Frame System to add extra carrying capacity on your day trips.
This is a great addition to your trainer. Easy to install, roomy enough for a 3L water bladder, and convenient to use. It helps you stay hydrated on longer rucks.