Portable webdav/file transfer

I was curious if anyone knows if a device exists that can be used as a portable hard drive with wifi capabilities. Where the device could fit in your pocket and have a USB slot so you could insert a zip drive into then use the device as a personal WebDAV to transfer files to your iPad. I'm a sales rep on the road and often need to transfer large files from a zip drive to my computer then to my iPad. I was wondering if you could just cut out the computer part with a portable device like this.

There are still ZIP drives out there? How about LS-120s? ;)

I use a device called AirStash that does much of what you want - swing by www.airstash.com and check it out. If gives you wi-fi access to files and they recently added webDAV support so some apps can save files right to it, and it plugs into a USB port for file transfers and to charge.

Thats exactly what I'm looking for.

Thanks for the help.