Might I suggest searching the interweb for "homebrew backpack yagi". There's a lot of plans, videos and tutorials online that describe how to build what you're looking for. Tape measure yagis work but it's probably cheaper, easier and lighter to build them out of stiff wire, arrow shafts, etc. I've built them this way and they do work, and they can be made to break down to fit in a tube for transporting. If you cut the elements for about 146 Mhz they cover the 2 meter band pretty well.