Amazon (AMZN) has built an e-commerce juggernaut thanks in large part to Amazon Prime. But for all the goodies you can buy with the two-day shipping perk thanks to the $99-a-year service, there is so much more than that.

Started in 2005, Amazon Prime has become the envy of nearly every other retailer because of its ability to hook users and keep them shopping. A July 2016 study from Consumer Intelligence Research Partners found that the average Prime user spends around $1,200 a year on the site, compared to $500 for a non-Prime user.

Stats like that have helped make Amazon the leader in e-commerce, JMP Securities analyst Ronald Josey wrote in a December 23 research note.

"[W]e believe Amazon's lead in e-commerce continued to expand throughout the holiday season," Josey wrote to clients. "We are also incrementally confident in our holiday e-commerce growth projection of mid-teens growth as mobile increasingly becomes a larger channel for overall purchases, representing a long-term tailwind, in our view. 

Yet, even though the 60 million-odd Prime users spend more on Amazon than its other users (Amazon has never publicly said how many Prime users it has), there has to be more than just two-day shipping and a wide selection of goods to keep them coming back, right?

That's where the hidden perks of the service come in -- things like video, photo storage and more.

In December, the company announced that it would be bringing Prime Video, its Netflix (NFLX) competitor to a slew of other countries and households across the globe. William Blair analyst Ryan Domyancic believes it could be as many as 275 million households, according to a December 14 research note.

With perks like that, it's no wonder why more than 1 billion items shipped thanks to Prime and Fulfillment by Amazon this holiday season.

Here are 20 reasons besides free two-day shipping to love Amazon Prime.

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