We need this specific size of pail to use with the humane mouse trap that goes on it as a lid. It’s not essential for it to be 20 litres, but the diameter needs to be 30cm.
This pail is common because many commercial goods are sold in these, anything from yogurt and hommus, to building materials and chemicals. Most commercial entities will have these pails when they buy anything wholesale or in bulk.
Please let me know if you can spare one. Thanks!