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+--- Day 7: Handy Haversacks ---
+
+You land at the regional airport in time for your next flight. In fact, it looks like you'll even
+have time to grab some food: all flights are currently delayed due to issues in luggage
+processing.
+
+Due to recent aviation regulations, many rules (your puzzle input) are being enforced about bags and
+their contents; bags must be color-coded and must contain specific quantities of other color-coded
+bags. Apparently, nobody responsible for these regulations considered how long they would take to
+enforce!
+
+For example, consider the following rules:
+
+light red bags contain 1 bright white bag, 2 muted yellow bags. dark orange bags contain 3 bright
+white bags, 4 muted yellow bags. bright white bags contain 1 shiny gold bag. muted yellow bags
+contain 2 shiny gold bags, 9 faded blue bags. shiny gold bags contain 1 dark olive bag, 2 vibrant
+plum bags. dark olive bags contain 3 faded blue bags, 4 dotted black bags. vibrant plum bags contain
+5 faded blue bags, 6 dotted black bags. faded blue bags contain no other bags. dotted black bags
+contain no other bags.
+
+These rules specify the required contents for 9 bag types. In this example, every faded blue bag is
+empty, every vibrant plum bag contains 11 bags (5 faded blue and 6 dotted black), and so on.
+
+You have a shiny gold bag. If you wanted to carry it in at least one other bag, how
+many different bag colors would be valid for the outermost bag? (In other words: how many colors
+can, eventually, contain at least one shiny gold bag?)
+
+In the above rules, the following options would be available to you:
+
+- A bright white bag, which can hold your shiny gold bag directly. - A muted yellow bag, which can
+hold your shiny gold bag directly, plus some other bags. - A dark orange bag, which can hold bright
+white and muted yellow bags, either of which could then hold your shiny gold bag. - A light red bag,
+which can hold bright white and muted yellow bags, either of which could then hold your shiny gold
+bag.
+
+So, in this example, the number of bag colors that can eventually contain at least one shiny gold
+bag is 4.
+
+How many bag colors can eventually contain at least one shiny gold bag? (The list of
+rules is quite long; make sure you get all of it.)
+
+