Use the plastic lids that perishable items are sold in. I find that cottage cheese lids, and country crock covers are very useful holding an array of colors. And best yet, they are used 100 times over instead of filling a landfill.
I like to use any type of plastic jugs with a handle, the thicker the better to hold paint. I wash them out of course, allow to dry, then using a sharp utility knife, I cut out the front of the jug about half way leaving the handle in tact. I pour in my paint and always have a 'handle on it' when I paint!! lol.
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