var PostPackages = InventoryList< PostPackage >(items: [])

PostPackages.add(item: PostPackage())
print("Number of posts elements: \(PostPackages.numberOfItems())")

var FoodPackages = InventoryList< FoodPackage >(items: [])

FoodPackages.add(item: FoodPackage())
print("Is capacity low? \(FoodPackages.isCapacityLow())")

FoodPackages.remove()
print("Number of food elements: \(FoodPackages.numberOfItems())")