A sponge. Takes up a pretty good volume but doesn't weight much. Then you put it in water and it absorbs it. You take it out of the water then - it is maybe a little larger in volume, but it is much heavier. It now has a real weight, but not a bad weight. It is not that the sponge's boots are heavy, but that it is no longer empty. And it will stay all nice and full for a while until it dries up naturally, from evaporation - and when it dries up from evaporation, there is lots of time to dunk it back in the water so that it will be saturated again.
But on the other hand, you can pretty easily wring it out.
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