Definition from Wiktionary, the free dictionary
- a gift, purchase, etc. whose contents are concealed until after a selection is made
- Winners can choose a gift from the grab bags on the table.
- (idiomatic) any random assortment, selection or possibility
- With that system, it's a grab bag which files we can find at any moment.
- A moderately large bag of crisps or other snack, intended for sharing.