If you wish to indicate that there are more than one of a particular item, use the plural. Why, may I ask, do you single out these two items specifically? The same "rule" applies to everything in your list.
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AnonymousShould the underlined words be in plural, eg beach chairs and boxes?There is room for all our stuff -- beach chair, tents, tackle box, fishing rods and others.I know it's unusual to see these countable nouns without an article, but that's OK in a list like this.