Singles Day sales are set to get crazier this year, with transactions and deliveries expected to break records amid public concerns about quality.

E-commerce giant Alibaba Group Holding, which created the annual November 11 event, is expected to reach a new high on Friday, with a 40 percent surge as bargain-hunting Chinese consumers flex their spending muscle, according to a report released on Nov 2.

Singles Day sales at Alibaba this year are expected to jump to $20 billion from last year's $14.3 billion. The 2015 figure represented a year-on-year increase of 54 percent, the report said.