Green MondayWatch out, Cyber Monday. Green Monday is gaining traction with shoppers.

Consumers flexed their thumb-shopping muscles on Dec. 12, Green Monday -- the second Monday in December that's become another big day for online holiday shopping, according to ChannelAdvisor. The company runs the e-commerce platforms of 3,000 retailers ranging from Staples (SPLS) and Bed Bath & Beyond (BBBY) to Urban Outfitters (URBN).

On Green Monday, e-commerce sales at ChannelAdvisor's retail clients grew 19% over 2010 -- not far behind Cyber Monday, when the firm's merchant customers saw online sales rise 25% from the year ago period.

ChannelAdvisor does not disclose total sales figures.

The sales gains on Green Monday are a sign of consumers' robust and consistent online shopping pattern this holiday season, ChannelAdvisor spokeswoman Sarah O'Dea tells DailyFinance.

"Last year, we saw dips and spikes in online shopping," she says. "It's been more steady this year."

Another telling number: Online sales from Dec. 1 to Dec. 12 for ChannelAdvisor's retail clients surpassed what the company calls "Cyber Five," the five days from Thanksgiving until Cyber Monday. O'Dea says this suggests that shoppers will continue to tap e-commerce for the remainder of the holiday season.


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