Fill the beanbag into the bathtub. Make something like a funnel (I used an empty paper towel roll) and wrap it with tape. If you try to just pour it in, you'll end up with a mountain of 1/2-inch shiny, slippery beads that have static energy that makes them stick to things! We refilled the existing beanbag. It may take some work to figure out how much topping you need; One was perfect for our large but not overly large chair, but it was already about 1/2 full (with a few crushed beads). In other words, I would do all the work of knowing the volume of your chair before deciding how many boxes to buy.
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