grab bag
noun
High School
1
A gift, purchase, etc. whose contents are concealed until after a selection is made; a bag as gift that comprises mystery prizes.
2
A bag from which a gift or prize may be withdrawn (grabbed) unseen.
3
Any random assortment, selection or possibility.
4
A moderately large bag of crisps or other snack, suitable for sharing.
5
A bag containing essential items, which can be easily picked up and taken in an emergency.