Chirp chirp - pun malfunction

Ah, it was supposed to be so grand, as today I was asked to get TWO bags of bird food for Mr C's pigeons. If you've seen this here: https://www.goodgym.org/reports/a-bag-of-bird-food-in-the-hand, you probably know where I was gonna go, but alas no, the limited supply of snacks for feathered creatures (the half-empty shelf now bearing resemblance to the baking aisle) put a spoke in my pun wheel. Instead I had to get a BIG bag of bird food. Get ready, here it comes anyway: If a bag of bird food in the hand is worth two in the bush, what is a big bag of bird food?