case casing cover covering shell sheath jacket husk hull capsule housing encasement armour armor sheathing cocoon container vessel shuck skin wrapper wrapping envelope sleeve integument coat folder pericarp holder receptacle wrap frame seedpod box repository canister carapace outside exterior bur cartridge lid layer enclosure cowling cradle bin cast cask caddy chest storage can packet cylinder casket pot carton tin caisson vat chamber package dress lagging insulation threads top bubble guard protection awning exoskeleton mantle tarpaulin caparison cope bark crust shelter cap blanket plastron shield defence defense shard scale surface face exteriority veneer facade façade superficies coating front bag drum unit