Soil Moist™ Mats for vacation watering makes it simple and easy to keep your plants watered while you are away.. The Soil Moist Mat absorbs water similar to a sponge. The mat will release water as the soil slowly dries out. Just place the mat on a water proof surface, slowly saturate with up to two quarts of water and place your potted plants on the mat. Each pack contains 2 mats 15.75" x 11". They can keep plants watered for up to 3 weeks. Can be used to keep your plants watered even if you don't go away on vacation!