Calculate trip's new available volume
Calculate trip's new available volume

bicyclethief/caravan,nyc-rock-doves-2015/caravan,nyc-rock-doves-2015/caravan,grantziolkowski/caravan,grantziolkowski/caravan,nyc-rock-doves-2015/caravan,bicyclethief/caravan,bicyclethief/caravan,grantziolkowski/caravan