The Best Places to Buy Bunk Beds Bunk beds are a great option for kids bunk beds' rooms and come in a wide range of designs. Besides the traditional twin over twin design you can also find futon bunks as well as triple bunks that fit in small rooms. When you are choosing a bunkbed be sure to consider the capacity for weight. Most bunk beds can support an upper limit of 400 pounds for each mattress. However you can find beds that have higher weight limits for children who are older and teenagers. 1. Amazon Bunk beds can be an ideal option for parents looking to maximize space in their tiny bedroom, or for children who wish to add a fun element to their room. There are a variety of options, including full-overfull and twin-overtwin designs. Some even have the fun factor of slides. If your children are on the younger side look into a twin-over-twin bed with guard rails for children younger than six years old, or even bunk beds for toddlers.