Outside groups are bracing for surprises in the massive government-funding bill the Congress is expected to consider next week.

The $1.014 trillion bill funding most of the government through September 2015 is one of the last trains out of the station, as the 113th Congress is set to close shop on Friday.

That means it could be a final chance for lobbyists and lawmakers alike to find a vehicle for their priorities.

“We’re ready to be surprised,” said Steve Ellis, vice president at Taxpayers for Common Sense, which regularly highlights hidden measures included in funding bills.

Appropriators preparing the bill are keeping a tight lid on its contents. They are expected to release the legislation on Monday.

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