Dragging
Source Player Core pg. 235
In some situations, you might drag an object or creature rather than carry it. If you’re dragging something, treat its Bulk as half. Typically, you can drag one thing at a time, you must use both hands to do so, and you drag slowly—roughly 50 feet per minute—unless you have some means to speed it up. Use the total Bulk of what you’re dragging, so if you have a sack laden with goods, use the sum of all the Bulk in it instead of an individual item within.