A basket can be used to carry up to five pieces of fruit. Empty baskets may either be purchased from farming shop, or crafted by players with a Crafting level of 36. Crafting a basket yields 56 Crafting experience. This process involves weaving 6 Willow branches by using a loom. This is one of the tasks in the Medium Falador Tasks set (by using the loom inside the farmhouse west of the cabbage patch).
The "Fill" option will instantly fill a basket with up to 5 fruit from the player's inventory. "Empty" will remove all of the basket's contents, provided there is room.