I ordered the 20 lb bag because I have several deflated bean bags and I was tired of the polystyrene flattening out. First, even though it's cheaper, DON'T buy the 20lb bag... buy four 5lb bags instead. Then you can put the bag INSIDE the bean bag before opening it. I had a huge mess on my hands and one shirt that is still covered with microscopic pieces of foam. Second, I would say 10lbs would fill one standard Big Joe beanbag. Third, foam does not work well with the chair shaped bags because it is not stiff enough to hold shape. It makes great regular beanbags, though, and is a reasonable alternative to polystyrene.

Got this to add a little extra fluff to a bean bag we have. I had ordered the 4 foot Big Chill bean bag off of Amazon before. It has memory foam chunks inside. After SEVERAL children from a 5 year old to 17 year olds using it for 7 months, the foam was not quite as fluffy as it had been. I expected that to happen and figured that I would eventually add to it. I got this shredded foam to add. I only got the 2.5 lb block. I wasn't sure how much I would need as I didn't need to refill the whole bag, just to add some extra fluff to it.
It comes and it's compressed into a square that measures about 10 inches by 10 inches. It was fairly hard to open as it was in a bag, and then the bag was taped with clear packing tape the entire way around it. I had to use scissors to get it out of the tape. I took it out of the bag and it remained in a cube for me. The bean bag has a double zipper inside, I unzipped those and threw the chunk in, zipped it shut, replaced the cover and then broke the foam up once it was secured inside. This worked really well with not much mess. I actually ended up with more of the chunks that were already in the bean bag getting out than what came off this block. The stuff in the bag was a little staticy which made it want to stick to my arm and the zipper. The block wasn't like that, I only had a small handful of pieces fall off and I just picked those up by hand afterward.
I really liked this fluff and seeing now after I have it in, I probably would have ordered the 5 lb block. My daughter thought it was enough when she was sitting on it. But I would have liked it to be just a little more. I may order another bag at some point to throw in there.

Excellent quality, super soft, but beware if you are using this to stuff a Pottery Barn furry bean bag. It will create havoc with the fur! I literally had to pull the foam piece by piece from the fur with a little help from some Static Guard & a comb. Luckily I realized this after the first 5lbs. (Not the foam's fault, it's just static.) It took 12.5 lbs to fill a large Pottery Barn bean bag. It is so soft and comfy it's like lying in a cloud. So much better than any beans in a bag. Huge upgrade for sure!

Tip: I started with 2 5 lb bags, I opened the first bag inside the cover, but the static had the foam coming out everywhere. For the 2nd bag I sprayed the opening and my arms with Static Guard and had a much better experience.

I made a huge mess just trying to remove the bazillion layers of tape off of the bag and even more when I filled the beanbag chair. But it's been a few weeks and the chair has held up wonderfully and has not lost its shape at all. The smell wasn't horrible like in some other reviews I read and it goes away quickly. After buying this product I would NEVER buy the foam beads again, this holds the shape perfect! The mess my daughter and I made did NOT overtake the floor (30 seconds with a broom ansnit was cleaned up) and we found the more that escaped the funnier it became! We will buy this product again!

Very happy with this product. I purchased the 5 lb bag. It comes in a small vacuum-packed square that doesn't look like it could possibly be enough, but after I opened it & let it "breathe" & expand for about three hours, I found it was more than enough to fill cushions for my 5 ft. rocking patio sofa. (short-back, seat, & arms). I had enough left over to fill a nice size throw pillow. It is soft memory foam, but it does not collapse. It didn't have any offensive smell, & was very clean & fresh. I've had it in my back yard now for a couple of months, & it's holding up very well, with no sign of matting or compressing down. It provides nice, comfortable support. I'm very pleased with my purchase, & would not hesitate to order this from Bean Products again. :) jlp