We found that the UHT cartons could not cope with the corrugations of the Tanami and Gibb River Rd. Fortunately, we'd stored them in plastic cubes in our CT and the spilled milk didn't go far (so not much crying :-). Conversely, we use old plastic milk bottles to store water (9 x 2 litre bottles fit neatly in a plastic cube) as a back up supply and have never had one leak. Cheers.