I purchased the Junior Lounger for my 1-year old and it's big enough for 2 older kids to even use to lay on.  This brand is more expensive than other bean bag options, but it's well worth the cost.  Our PTA bought the larger size lounger and the stool version for us at school (I am a teacher) and they hold up really great in the classroom with a lot of use.  The material is great for wiping off easily!