USB connection kit from Samsung is great but forces the user to hold it in awkward position, especially if you are watching the movie while holding the Tab Plus in your hands. An xda user bought himself a cheap third party USB host adapter and glued it all together to one lump. The adapter is actually meant for use in P1000 but works fine in Tab 7.0 Plus. He then paired it with a tiny microSDHC reader. Here is how it looks like.
Clearly, the result is a much more compact external storage solution that does the job of allowing me to transfer files to a USB drive instead of the tablet itself while not making the tablet annoying to hold afterwards.