Hydrofarm's 3.5 gallon black bucket. Buckets can be the true building blocks of your indoor hydroponics setup or outdoor garden. They're an ideal way to transport media, water, and other nutrients, as well as a collection receptacle for all your other accessories. From its sturdy construction to its strong carry handle, you'll find many reasons to tote this bucket. Available sizes: 3.5-gallon and 5-gallon.