Grill Tek Marinating Tray

Selling a Grill Tek Vacuum Seal Marinating Tray. This tray is designed for quick and easy food flavoring before barbecuing, with a 75 fl. oz capacity. I originally purchased this in the USA, where it retails for about $29. I have never used it and am unsure how to operate it, but there are videos available online that provide complete instructions. I do not have the original box or instructions.