Nathan Push-Pull Cap Flask 10oz (2-Pack) Water Bottles and Drinkware Clear : Nathan Push-Pull Cap Flask 10oz. water bottles are designed to deliver more water when you need it with high-flow, soft-sip nozzles. The silicone grip caps are easy to grasp, even with sweaty hands. Fits the Nathan Speed 2, Trail Mix, Trail Mix 4, and all QuickShots. BPA-free. Dishwasher safe (top rack only).