This interesting experiment has been carried out by throwing a camp waste bag into a volcano lake which is mildly active.
The details of the garbage bag and the height are given as below.
The test was performed with a box of camp waste (largely food rests) in a bin bag. Estimated weight 30kg, Size 60x60x60cm. Fall height, about 80m. The lake reacts with violent lava fountaining activity, presumably in part due to steam produced from the organic matter.