A Sturdy Sled is a vehicle which can carry four objects. When empty the Sled can be equipped to your Backpack equipment slot for easy transport. Right-click the Sled and choose "Pick Up" when it is standing on the ground to equip it, and Ctrl + Left-click on your equipment screen to drop it to the ground again.
You load objects onto the sled by first carrying them ( Adventure ⇒ Lift) and then Right-clicking the Sled. The object will be represented as a sack on the Sled. To retrieve an object from the Sled, Right-Click the sacks.
To pull the Sled when it is loaded, Right-click it and choose "Pull". To stop pulling, Right-Click the Sled and choose "Stop".
Sleds can be lifted when they are not laden using the Lift action without being put in the backpack slot.