I've been thinking that stackable jugs would be amazing for years and finally thanks to Aqua Lab my dreams have come true. They work like a charm and are a great value for the money!
These jugs are extremely durable. The only problem is that the two "parts" on each side of the spout trap water. Basically, if you pour water and reach the end, some water gets stuck in those valleys which make you dump the last bit a few times. This is not a serious burden so I'll give it 4.5 stars if I could.