8 x 12 Nylon Bag. The nylon bags that we manufacture are sewn with a five-string merrow machine with a full safety stitch inside. These nylon bags are actually made from 100% polyester with a polyester tie cord. They are presently available in six sizes: 4x12, 6x12, 8x12, 6x14, 8x14 and 10x14. The 10x14 size is great for canister filters