Lightweight Bike Trailer From Rubbish

i had been using a trolley with tiny wheels that often flipped over and i wanted something  that i could move my stuff around  either on foot or behind a bike....
i wanted something that when not in use could fit in hand luggage
so i designed this trailer that breaks down by undoing three bolts into four lengths of tubing and the two wheels
and built it using locally found rubbish, namely a broken 3 wheel buggy, two damaged bike frames, and a sheet of plywood.