Chicago Cubs
A personal amount of food in a small, disposable bag is allowed.
Factory-sealed plastic bottles are allowed (empty non-sealed bottles are fine too). No glass, cans, or thermoses.
No alcoholic beverages may be brought into Wrigley Field.
Soft-sided coolers smaller than 16x16x8 in are allowed. Hard-sided coolers of any size are prohibited.
Bags smaller than 16x16x8 in are allowed (purses, drawstring bags, fanny packs, lunch bags, soft-sided coolers). Backpacks and hard-sided coolers aren't; exceptions for medical and diaper bags.
Wrigley welcomes a personal amount of food in a small disposable bag and even waves through a soft-sided cooler under 16 by 16 by 8, which my chambers read as an engraved invitation for a personal amount of spaghetti. I rule YES: factory-sealed sauce rides in the soft cooler, the noodles in their humble disposable sack, and the whole operation clears the bag policy with inches to spare. Mind only that the thermos and the hard cooler are contraband and the alcohol stays home; the spaghetti, ivy-blessed, is safe.
Unofficial, untangled, and legally meaningless. Trust the real rules above.