The illusion also occurs when the objects are not lifted against gravity, but accelerated horizontally, so it should be called a size-mass illusion. Similar illusions occurs with differences in material and colour: metal containers feel lighter than wooden containers of the same size and mass, and darker objects feel heavier than brighter objects of the same size and mass. These illusions have all been described as contrast with the expected weight, although the size-weight illusion occurs independent of visual estimates of the volume of material  and the illusion does not depend on expectations, but occurs also if visual size information is only provided while already lifting.
The illusion also happens when objects are accelerated horizontally instead of lifted against gravity, so it should be called a size-mass illusion. Similar illusions occur with differences in materials and colors: metal containers feel lighter than wooden containers of the same size and mass, and darker objects feel heavier than brighter objects of the same size and mass. These illusions are all described as being a contrast to what is expected in terms of weight, although the size-weight illusion occurs regardless of visual estimates of volume and does not depend on expectations, but can still occur even when only visual size information is provided while lifting.