As the swell of holiday shopping subsides, online retail appears to have gained momentum this year.
But traditional retailers and e-tailers alike face challenges to dominate in 2016, including weather, prices and profitability, experts told CNBC.
On the online front, Amazon's Prime membership service had a "record-setting" holiday, a press release said Monday. Two-hundred million more items received free shipping this year, Amazon said, adding that last year's device sales also doubled.
The e-commerce giant wasn't the only company sending more, with shipping service deliveries reportedly snared by a last-minute spike in e-commerce.