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Every time you buy one, you get a $2 credit — so they're basically free!

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Here’s reason No. 948576875 why becoming an Amazon Prime member would be a great move: Apart from enjoying free two-day shipping on a myriad of products and unlimited streaming of movies and TV shows from their Prime Video section, you’d get access to a secret section of travel-sized goodies — and for only $2 a pop.

Related: The 20 Best-selling Travel Products on Amazon

To all you fellow travel junkies, just think about the carry-on possibilities — from mini toothpaste tubes, to tiny on-the-go lip glosses, to even fun-size snacks in case airplane pretzels aren’t your thing. What’s more is for every sample product you buy, you’ll score a credit equal to that price for future use on a full-size product in that category. For example, if you purchase a $2 facial toner, then you’ll instantly earn a $2 credit to go towards buying a full-size skin care product.

Related: The Best Carry-on Luggage You Can Buy, According to Amazon

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To buy: Women's Luxury Beauty Sample Box, amazon.com, $20

Oh, and let’s not forget Amazon’s offering of sample boxes with multiple pint-size goodies inside — à la Birchbox — in case you’re in the mood for trying out a bunch of products. Sounds like a mighty fine deal to us. Head to amazon.com to access the Prime Samples shop.