We recommend having at least one obstacle per player on your battlefield, allowing them to take cover during gameplay. Sometimes that's easy - in a forest or park there's always more than enough places to hide. 

Inside a building or on more open locations, it's not as easy to find sufficient cover. That's where our obstacles come into play. They are lightweight, can be set up (and torn down) in a matter of minutes and come in a variety of shapes and sizes which can easily be combined into the cover you need. 
These pop-up hides are lightweight and are best used indoors.
Inflatables require electricity for the setup, and can be used indoors as well as outdoors.