Indoor watering cans are smaller and lighter, typically holding less than a gallon of water for easier handling around the home. A watering can's spout size also impacts your plants because it determines how water is delivered to the plants. Durability and weather-resistance are more of a priority for outdoor watering cans, so they're generally made of thick plastic or steel. Each of our recommended watering cans has a large handle for gripping from multiple angles. How We SelectedI researched watering cans from verified customers online to compile a list that spanned various materials, spout designs, sizes, and prices.