Well the answer is yes, unless of course you have a shitload of boxes to land on and excellent wingsuit accuracy.Stuntman Gary Connery became the first person to land a wingsuit without the aid of a parachute on the 23rd of May. He jumped from a helicopter at 2400 feet a mile away from his 350 foot target of 18600 cardboard boxes set up 12 foot high and 50 foot wide.
Here is one video with a short interview with Gary at the end:
Here is the footage from above:
And here is the raw footage of him landing: