This is a great toy for encouraging toddlers and preschool children to explore and be active - and my 10 year old has been known to crawl through it too! It's very easy to store by squashing flat and securing with the tabs so it doesn't spring open. You can simply tuck it behind a sofa, under a bed etc. The tunnel itself is springy so once open it stays up.
We've used the pop up tunnel for encouraging our littlest to crawl. We sit and peek through one end while he sits at the other watching us, eventually the curiosity takes over and he starts to crawl through the tunnel. Playing peekaboo through the tunnel was also a favourite. My older children use it as an entrance to home made dens and the pop up playhouses you can buy. You can only enter if you come through the tunnel - a sure fire way to keep mum out! During the summer it often forms part of a timed obstacle course around the garden where they commando themselves through the tunnel as quick as they can or they roll around the garden in it.
Our tunnel has stood the test of time and is still working fine - if a little muddy. For the price it's a pretty versatile toy that can be enjoyed by a wide age range of children in different ways.