The short answer is "No". Drawstring bags
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are usually made of man-made materials, such as polyester, polypropylene and vinyl or natural fabrics, such as cotton/canvas or jute. Untreated natural fabrics are very absorbent, so we won't even talk about waterproof here.
Artificial fabrics (such as polyester) are often naturally woven tightly, which
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increases the time required for water to penetrate the fabric thread. If the polyester is thick enough, you may notice water droplets on its surface, which means that the fabric is waterproof. Therefore, to our question about whether the
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drawstring bag is waterproof, the long answer is "No, but they have different degrees of waterproof, depending on their materials.
So if polyester drawstring bag is
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advertised as "waterproof", don't believe it. The manufacturer may refer to the natural waterproof property of the fabric, or the fact that the fabric becomes "waterproof" after DWR treatment. A real waterproof bag will involve multi-layer, seam sealing
