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can anyone give me tips as to how i can get good photographs of polybags which are transparent without getting flash shine ...

A similar question was recently posted in one of the other forums, so this seems it's becoming a stock answer for me...
Depending on how large they are (I assume fairly small) your best bet would probably be to use a light tent. Here's a site in the UK, and others can be found with Google: http://www.stevesphotoshop.co.uk/

The semi-transparent types are best since the light is softened by directing it through the walls, instead of bouncing inside. Obvious when you see the photos in the link.