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It's been a record-breaking holiday shopping season for e-commerce

With only four days to go until Christmas, it’s already already a record-breaking holiday shopping season for e-commerce, according to Adobe Analytics latest figures.

Since November 1 through December 19, $110.6 billion was spent online, a 17.8% increase from last year's $93.9 billion, making it the biggest online shopping period ever in the U.S., according to Adobe.

“Weary holiday shoppers continue to look for alternatives to crowded stores, long lines and empty shelves in the final push to Christmas. Retailers who can offer the easiest shopping experience, whether through excellent use of data to anticipate shoppers’ needs or by providing an option for picking up products at brick-and-mortar stores, are the ones people are flocking to this week. With a record 47 percent growth in Buy Online Pick Up In-Store (BOPIS) purchases, retailers need to impress consumers in both the real and virtual worlds,” said Taylor Schreiner, director at Adobe Digital Insights.

To put this shopping season in perspective, Adobe forecasted that nearly $1out of every $6 spent this holiday season will be online.

Mobile is playing an increasingly critical role for retailers' e-commerce strategy, with $33.3 billion worth of sales coming from smartphones, an increase of 57% a year ago. What's more, more than half of the traffic, approximately 58.3%, to e-commerce sites is coming from mobile devices, the report found.

Some of the big winners will be Amazon (AMZN), and eBay (EBAY), with more than one-fifth of the 1,000 U.S. shoppers surveyed planning to do more than three-quarters of their online shopping on those sites, according to the survey.

Adobe is forecasting at least $126 billion in online retail sales in the U.S. for November and December.

Julia La Roche is a finance reporter at Yahoo Finance. Follow her on Twitter. Send tips to laroche@oath.com.