If a backpack is not suitable for you,you really won't do better than a Numatic.
One of our NVP370s has has been going strong for nearly 5 years,and we still use it for all the crappy jobs,you would not believe the abuse it has taken but it just won't give up.
If cable length is an issue it is easy to rewire with a longer cable if you know what you are doing,or get a sparkie to do it for you.-John