grab bag
noun
1- N. Amer. a lucky dip in which wrapped items are chosen by people at random〈北美〉摸彩包, 摸奖袋。
1.1
- an assortment of items in a sealed bag which one buys or is given without knowing what the contents are（在不知内有何物情况下买来的或别人给的, 内有各色物品的, 封着的）什锦包。