Single hammocks are usually 4-5 feet in width and have a weight capacity between 300 and 400 lbs; they're a popular option among those who're planning on using it on their own, mainly to sleep, read or chill out peacefully;
Double hammocks aren't just a great option for two (duh!): with a typical width of 5-6 feet and a capacity that ranges between 400 and 500 lbs, they're a more comfortable choice for those who're planning on using it to work on their laptop, keep a few books next to them and have a bit more room in general; they're also a better choice if you have a few kids who can't wait to sit down on it together.