Use a mesh lid like this with a wide mouth Mason jar to sprout seeds.
Wide Mouth Size: stainless steel sprouting insert lids, inner diameter: 2 4/5 in (72 mm), Outer diameter 3 3/8 in (86 mm), perfect for wide mouth Mason jars. A perfect size mesh screen allows easy draining and empty the water from the Mason jars but no loss of seeds. This excellent jar sprouting kit keeps the ventilation and supply the oxygen they need, making germination easier!