All in one hydration and resistance tool for pool workouts with adjustable capacity from 500 ml / 1 lb to 2500 ml / 5 lbs, allowing you to scale resistance while staying hydrated. Five color options to suit an active lifestyle, while maintaining structural integrity in environments from 0 to 40 C for reliable performance. Multfunctional design combines hydration management with resistance training, enabling effective pool workouts and versatile dry land use. Built with PETG and PP materials and a slip resistant handle; leak proof construction features a 9 cm wide mouth for rapid refills and sealing performance improved by 50 percent. Ideal for fitness enthusiasts, patients in rehabilitation, and outdoor athletes seeking strength building and hydration control in a single device. Use scenario 1: In the pool, fill to your desired capacity and perform resistance exercises such as curls, presses, or kicks while sipping water as needed to maintain hydration. Use scenario 2: Rehab or therapeutic sessions with low to moderate resistance to support controlled strength building and gradual progression. Use scenario 3: Outdoor training or travel, where you can refill quickly between sets, maintain hydration, and adjust resistance for mixed cardio and strength routines.