mixed bag

Any bag containing a mixture of something.

“a mixed bag of nuts”

By extension, a group of entities with few characteristics in common; an assortment.

“The people I met at the support group were a mixed bag: some were grouchy pessimists, and others were cheery do-gooders.”

Something tending to have both good and bad results or characteristics; something having a mixture of advantages and disadvantages.

“Owning a car is a mixed bag. It is convenient, but also costly.”