Doesn't matter. All you need to do is make sure the 2 are the same thickness. Exactness won't count because it doesn't have to "fit" something. It's just a bag.

My only thought is that a poly would be more parctical than cotton.

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Kayavlon Impex is a leading supplier of cotton yarn in India & has been exporting world class quality cotton yarn to various countries across the globe creating its demand for quality products in Europe, Asia, Africa and America. Cotton is a natural soft staple fibre growing on cotton plant. Raw Cotton fibre is mainly spun into Cotton Yarn and Cotton Thread. Cotton yarn is widely used in making fabrics for clothes, home-textile like bed-sheets, mattress, table cloth, terry-towels, bath-robes, socks & many other uses. Its quick water absorbing feature makes it used widely all over the world. Cotton is mainly grown in India, America, Africa and Egypt

100% Cotton yarn can be combed and carded in ring spun or open-end for knitting & weaving. We can offer 100% cotton yarn combed & carded, polyester, viscose blended polyester / cotton yarn in the range from Ne 6s to 80s in single and doubled yarns for knitting, weaving, and sewing thread. Cotton yarn can be used for weaving as well as knitting fabrics. Cotton yarn can also be used as sewing thread & for making ropes for several uses.

Organic Cotton is grown without insecticide or pesticide whereas Conventional Cotton uses large quantity of pesticide & insecticide, which makes it less hygienic. The production of organic cotton is more expensive as compared to conventional cotton as it uses several scientific methods for the cotton crop to be grown. Cotton yarn having lustre is known as Mercerized cotton. Mercerized cotton adapts to more brilliant colors & better finishing & lustre. Also several blending can be done with cotton such as Polyester Cotton (PC) also known as Terry Cotton. Polyester Cotton is mainly blended in the combination of 65% Polyester and 35% Cotton. This gives the PC yarn characteristics of both - Polyester as well as Cotton. Similarly other such combination is PV - Polyester Viscose Yarn, wherein Polyester fibre is mixed with Viscose fibre. India is the leading producer of cotton & has several factories for spinning cotton. We are leading supplier of Cotton yarn and PC yarn based in India & can supply you the following yarns.

http://www.kayavlon.com/cottonyarn.htm