Cyber Monday is set to add to one of the busiest online shopping weekends in history, following Black Friday's online surge.
Physical stores were relatively quiet on Black Friday compared to last year's mayhem as shoppers moved to take advantage of discounts online. According to Experian-IMRG, more than £1.1 billion was spent online on Black Friday, up 36% on last year. And the analysts expect another near-£1bn to be spent on Cyber Monday - up a third on last year.
As a result, Cyber Monday and Black Friday are expected to generate record online sales.
Amazon said it sold 7.4 million items on Friday, which it said was its biggest day of sales in the UK.
Various industry experts have warned that the volume of products bought would have a big impact on customer satisfaction, with delivery times set to suffer.
Chief executive of Very.co.uk and Littlewoods, Alex Baldock, said he expects deliveries to take up to 10 days, rather than the usual 48 hours.
Stuart Higgins from LCP Consulting told the BBC that Black Friday's equate to approximately 22 million parcels and expects a similar number on Cyber Monday. He said: "A staggering 10% of that won't be delivered on time and that's because retailers haven't got their back-end fulfilment capabilities - their organisation, processes and infrastructure - in place to cope with the marketing hype that has been created around Black Friday."