Champion Sports Cage Ball Bladder – Heavy-Duty PU Vinyl, Extra Large Valve, Fast Inflation - Sizes from 18 to 72 Inches

It's shaped like a big blue marshmallow. It's not round.PROS:I paid so little for this, it was worth it. (The price has since gone up)It holds air well no need to inflate it every time I want to use it, if it does need it, it's just a little bitIt doesn't roll away on windy days because it's not roundThe material feels rather feeble but if you're kind to it, it will lastCONS:Inflating it is a pain. It's got a huge round valve that easily loses air when you're inflating it, so you have to get it perfectly right and hurry up and plug it, which is tricky.Overall, I paid $22 for the ball and the cover (Amazon special! Yay!) so for that price, it's worth getting. Paying more than that? No. It's a step up from a beach ball really.I gave it 4 stars anyway, because I got a heck of a good deal from Amazon. So, I can't complain.

It arrived on time, in great condition, and was just as described. My son was thrilled.

Bladder did not fit cover - ordered twice - never could get one to match the other so returned both. Disappointed.

Was not happy with the description of the the product. I expected a round ball bladder but instead received a cylinder shaped bladder. What a hassle wouldn't recommend anyone purchasing this product.

Bladder is not round, but the vinyl bladder is thick. It was hard to insert into the cover, also to inflate. Someone used a shop vac but I didn’t have one and wasn’t about to buy one. I did have a metro dog hairdryer with attachments , the bal with the funnel attachment filled it up in less then two seconds. Not recommended for dogs