This race vest features trekking pole attachments that can be accessed without removing the pack, and reinforced bottom (70D nylon) for maximum durability. The side pockets are designed to carry any of our bottles and are equipped with a shock cord to store other items such as lighting, jacket or anything else that would need to be secured. The front pockets can hold a variety of bottles from our UltraFlask 550 Hybrid Bottle to our Softflask to our Human 20 2.0 with no launch. The Legacy comes with an insulated bladder compartment to keep fluids cool for a longer period of time. One size fits most.