grab bag

noun
1.
a container or receptacle from which a person at a party or the like draws a gift without knowing what it is.
2.
any miscellaneous collection.

Origin:
1850–55, Americanism

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
grab bag
 
n
1.  a collection of miscellaneous things
2.  (US), (Canadian), (Austral) a bag or other container from which gifts are drawn at random

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Idioms & Phrases

grab bag

A miscellaneous collection, as in The meeting amounted to a grab bag of petty complaints. This term alludes to a container offered at a party or fair, where one dips in for a party favor or prize without knowing what one will get. [Mid-1800s]

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
Not to be left off the gravy train, big business also pushed through its own
  grab bag of perks in the new legislation.
It's a bit of a grab bag, and the selection changes based on what the owners
  find on the market.
Earn twenty-five stickers and get a prize out of the grab bag.
Select a wetland artifact from a grab bag and learn the many functions of
  wetlands.
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