want the best?  get this one.
exactly what I have been searching for......  heavy duty construction, air and water proof. I ran over it with by truck is perfectly fine.....I am totally happy with this and getting a second one.  only thing that can be improved is the weight.  if it can be little lighter it would be 200% perfect. bit more cost but I will be willing to purchase this in titanium.
Rating: 5 stars