"Food Packs" are items that you have to find in Night 2 of Chapter 1. There are a total of 15 of them, 5 for each Friend (Blue, Green and Orange).
Appearence
The Food Packs are white bags with either a blue, green, or orange rectangle on the front side. This rectangle features various white colored dog bones in different orientations. The back of each bag includes a label, though its low quality makes the text difficult to read. Nevertheless, it can be inferred that the contents are likely dog food.
In Chapter 1
Following Night 1, the Scientist tasks the players to fill up the Food Dispenser with the food packs scattered around Hemlock Woods. Once all are collected and filled in the dispensers, the night comes to an end.