For an even, proper, and aesthetically pleasing shape, we recommend foam flakes or polystyrene fibres. You'll need about 100 litres of polyester balls to fill a 70 x 70 x 30cm.
It's crucial that you take your time when you fill your Boujad Floor Pillow. Place the inserts far into the corners of your pillow. It will even out the corners and bring the full shape of your pillow.
We also recommend that you insert the filling in small volumes. Doing otherwise may cause your pillow to deform, seeming unaesthetic.
In addition, you're not required to fill it to the brim. Your pillow will become very firm. If you're aiming for that, good luck. If not, then it's beneficial to leave a little air in your padding.