I hand built this thing to take care of what my bike can’t. I have used it for almost 10 years now, and have had to make various modifications on it to work out bugs. The main box of it is padded and waterproof. I have taken it across mountain streems that were knee deep with no leakage and found that it also floats! The wheels are 16" fronts from scrap childrens bikes, and are attached through a 1/2" axle tube. I just recently was involve in a major wreck with it that broke that left side axle shaft, and busted a few other misc. parts and pieces. but for the most part it is still usable. I will need to fix it for next summers ride but for now it’s alright. and my pics still suck!