You could use small rolltop bags. SeaToSummit makes some (in coated nylon and silnylon) or you could DIY them if you have access to a sewing machine. Tight woven cotton or hemp with a rolltop instead of drawstring closure wouldn't leak.
In pre-nylon days waxed cotton was used for rain gear. Using melting beeswax into tight woven cotton or hemp would create a water tight fabric.
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