UPS said there will be delivery delays through the middle of this week due to a deluge in ecommerce orders beginning on Cyber Monday and in the days following, Bloomberg is reporting.

The orders on in those days exceeded projections, UPS spokesman Steve Gaut told Bloomberg, causing a “bubble” to develop at certain package centers. Heavy volumes forced one- or two-day delays for on some orders from last week, even as UPS worked over the weekend to play catch-up.

Gaut told Bloomberg that much of the backlog has been cleared up, and the company doesn’t expect to miss Christmas deadlines because of it.

“As a result of unprecedented shipping volumes in certain markets during cyber week, UPS has added one- or two-days time-in-transit on some deliveries,” said UPS spokesman Matthew O’Connor. “We have shifted more employees and other resources to these markets to address this Cyber Week surge and expect to have the issue resolved by midweek, this week.”

During peak season this year, UPS expects to process nearly double its normal average daily volume of more than 19 million packages and documents, O’Connor said. This year’s seasonal volume forecast is about 752 million packages, or 5% more than the…