The medium size T3 Bag holds up to 90 lbs of approved filler. (Sand) Versatile, portable and convenient for that quick powerful workout out anytime, anywhere. It transforms as a Sandbell, Kettlebell, weight yoke, dumbbells, & barbells depending on your workout. We use it on the beach to perform a variety of arm & leg curls, front & back squats, lunges, weighted runs, & any HIIT cardio routine. Outdoor fitness lover? Living life on the go? Looking for a fitness tool or a bag to supplement your current routine. This is the bag for you.