Most of the fill sold anywhere now is shredded memory foam. I don’t personally find this very satisfying to sit on when I want a beanbag, because I remember beanbag chairs from the 60s and 70s, that were filled with beads made of PVC (and, I think once, one homemade one filled with actual beans). More on boards.straightdope.com

Stuffed animals. Ehats your goal? Hay will be really heavy. Also decomposes. Do you mean straw? That will degrade over time into smaller and smaller bits. I have one of those stuffed animal storage beanbag chairs and use it to store spare blankets and comforters. So they stay clean but can still be used to sit on. So maybe get a bunch of comforters from goodwill and stuff it up? More on reddit.com

I worked lovesac production while in college. They are legitimately BIFL. Most people get rid of them because they're over it, few get to be worn out. They used to have a lifetime warranty that they would honor as well. LoveSac is using closed cell memory foam which is one of the reasons they're expensive. It's the 40-60 lbs of foam (several lay z boys worth) and shredding and shipping it is not an easy process. Regardless of age, when you pick them up and flip them over a few times they'll puff right back up as if they're brand new. They can hold you like a chair without being up against a wall. The big LoveSacs require about 10 yards of fabric, heavy duty zippers, stitching, etc, thats to both to removable covers and to shroud the insert, which is the other reason they're as expensive as they are. If you keep it 10 years being able to swap out the cover can refresh the look as the insert is the most expensive part. if instead you're going for a traditional bean bag, small, up against a wall, or just want to stay cheap, or plan on throwing it away in a couple years, that's fine, but note the ones filled with styrofoam peanuts or anything similar: they compress and don't come back. If you intend to keep a cheap one expect little, or that you'll need to refill it over and over and over. I'd avoid it as it's a nightmare mess to refill, you can't shape it as it has the structural Integrity of sand, and cannot hold you in a sitting position in the middle of a floor The competitors to Lovesac used to ship you a half empty bag and another bag of filler and have you fill it yourself. Not sure if this is still the case. Tldr. They're spendy, but do deliver and can be shaped to act as a chair / bed / recliner for 10 years±. More on reddit.com

Hilarious to me because just yesterday I opened up a Big Joe beanbag trying to correct the fact that most of the foam wasn't even shredded.. big mistake on my part. More on reddit.com