Before crossing the Pacific, we bought two five gallon collapsing buckets used for horses from Outfitters Supply, Columbia
Falls, MT. Unfortunately, it appears they don't sell the larger 5 gallon size anymore, but if you can find something similar, these are a great space-saving item for a cruising boat (we use them for lots of tasks). In a quick Google
check, I found this site selling the 6 gallon size: https://bucksbags.com/collapsible-water-bucket.html
: soak clothes overnight with small amount of detergent, next morning do the grape-stomping routine for a bit, drain, rinse, wring out and hang. Easy!