Opportunity:   An alternative to a zipper's ...usable in all kinds of clothing,
               travel bag's ...would be a good viable solution's ...particularly
               given that ...a zipper is subject to wear and tear.

               a viable option is ...parallel pipe's (sewen to each side of a pocket)
               with a thin piercing or a small vertical elongated hole along the 
               circumference on both the pipe's ...through which a zipper kind can
               be slid ...a fine muslin kind of material that can close the gap or
               seal the envolope ....the zipper lockable a the end.


  --------------------------------------------------------------------------------
 {        zipper with attached muslin cloth that can seal the gap   <----- }
  --------------------------------------------------------------------------------


             The design concept available in interior decoration ...covering  window's
             with curtains( shield or screen) on grails (specifically the mechanism
             present in the grails or track ...can be exploited) ...viz a metallic
             strip or chain that can be dragged or slid over to the grails as above.


{           stands for  lockable end point for zipper  
-------------------   pipe or track with small verital elongated piecing , over which
                      zipper can be slid or run through    
 <----- }   zipper dragging the strap made of cloth or metallic chain


Note: The above problem statement having been encountered in various scenarios
      and detailed in various 'Proof of concepts' as mentioned in 
      
       http://uk.geocities.com/ravivenkatus/projects.pdf
       http://ravishankarkv.tripod.com/projects.pdf
        ....apply appropriate
      'use-case' modeling, rationalize and arrive at a workable and feasible 
       solution both commercially and techinically viable.

             

           


 
             