How to say “Our mail cart is already loaded with parcels, so we'll need another one for these bags.” in Japanese
In Japanese
郵便の台車にはもう小包が積まれてるから、この袋を運ぶにはもう一台いるね。
Yūbin no daisha ni wa mō kozutsumi ga tsumareteru kara, kono fukuro o hakobu ni wa mō ichidai iru ne.