I've had small punctures in the bottom edge of the bags. I'm assuming mice or squirrels. We maybe lost 2-3 bags. We only have about 20 bags so this year we put duct tape along the bottom edge of the bag with it extending about 1/2 inch beyond the bag. I can't see doing this for 300 bags though.
There was some discussion on here about using deer spray on the bags, but I'd be worried about getting the smell into the syrup somehow.
2015 - 8 buckets, 332L sap, 8.5L syrup - Barrel evaporator, 2 steam pans
2016 - 8 buckets, 432L sap
2017 - 10 bags, 470L sap, 9L syrup
2018 - 20 bags, 1050L sap, 17.6L syrup
2019 - 20 bags, 970L sap, 22.2L syrup
2020 - 17 bags, 813L sap, 17L syrup