Some things to consider when considering portable camping sinks or wash tubs.
If you are tired of doing your dishes in campground bathrooms, underneath spigots, or having people roll their eyes as you rinse your silverware in the drinking fountain it may be time to bring the kitchen sink. ;-)
Good portable sinks should hold enough water to make clean-up as easy as possible but not so much that it's awkward to use or too heavy to dump. So find a tub big enough to submerge all your
camping cookware
and light enough to carry when full, unless you want to make multiple trips with smaller containers.
BackCountry offers one that seems like it splits the difference pretty well. It's Granite Gear's Kitchen Sink. At 2.25 gallons it's not huge but it will only weigh about 18 pounds when it's full. It also collapses down so that it takes up less space and two handles make it easier to carry. A good addition to your camping equipment that makes clean-up easier.
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Altrec also offers a "Folding Bucket" but at 5+ gallons it's huge and weighs over 40 pounds full, but if you need to frequently haul water or wash your dog it might be the way to go. It's collapsible and has two handles too. If you don't need a bucket of water though I'd definitely go with the kitchen camping sink.