Kids will ask for it by name so be a good parent and get them one. With a diameter of 90cm it's small enough to fit into any nursery or playroom. Perspective - this is our smallest beanbag but about the same size as the normal "cheapie" beanbags you used to buy on the side of the road!!
Now bear in mind that these bags last a very long time, we suggest looking at a bigger FatSak if you have the space. Buying the KidSak for an 8 year old is great but when they still have the bag at 15 years old it might not be sufficient.
The KidSak weighs in at around 7kg and contains about 300 litres of foam. The diameter for this FatSak is about 90cm with a height of approximately 40cm.