Buying a Bunk Bed With Double Bed A bunk bed that has an additional Double bunk bed with slide bed beneath can help you get the most of your small bedroom. The best bunk beds for kids are sturdy and safe. Make sure you choose guardrails that are sturdy to keep children from falling off or getting caught between mattresses. This solid wood bunk bed is Greenguard Gold certified and can be divided into two beds. The stairs are wide enough for adults and teens. Size Size is a major aspect to consider when shopping for a double bunk bed. Many children grow rapidly and it is possible that you will need to purchase a brand new bunk bed prior to them outgrowing the current one. The type of mattress you select is another important factor to consider when choosing the bunk bed. The most popular bunk bed configuration is twin over twin. They have two beds of the same size stacked on top of each other and are great for siblings who share a room.