A scanning system for data reading, and related methods of use, the scanning system including a portal scanner and a conveyor for transporting items. The scanner includes a generally U-shaped scanner housing and a plurality of data readers arranged within the scanner housing for reading data on various surfaces of an item being transported through the portal scanner. The scanning system may also include a bottom scanner positioned beneath the conveyor, the bottom scanner having a view volume directed through a gap in the conveyor for reading a bottom surface of the item through the gap as the item passes over the gap. In some embodiments, the scanning system may further include one or more light curtains configured for determining a height dimension of the item and/or a position of the item.