The media could not be loaded.Love love love this bop bag. Both my two year old and 10 month old girls love to push it over and watch it bounce back up again. The instructions printed on the toy said to put water in the bottom end labeled 1. However, I read reviews about it leaking after a few days. So I purchased two 1.25 lb bags of craft sand (‘Be Good Company Natural Sand (Refill Pack)’) to fill the bottom with. I originally just filled it with 1 bag but the toy wouldn’t pop back up. So I highly recommend two bags of sand (2.5lbs). The hole on the bottom is slightly bigger than a quarter so it was easy to pour in. I just cut a hole in the side of the sand bag and poured it right in with no trouble. Then, you just blow up the body from the side labeled 2. Had it for almost two weeks and my kids jump on it and push it over and it’s still super inflated. I haven’t notice any loss of air yet. Highly recommended.Link to sand bag I used : https://smile.amazon.com/gp/aw/d/B00J4YJ9HS?psc=1&ref=ppx_pop_mob_b_asin_title