We recently spotted this Gift with Purchase Promotion with Novartis Vitamin C in Hong Kong Pharmacies.   This type cover is excellent with powder drinks that can fizz up and is used around the house and office in the long term.   This top keeps drinks warm or cold by insulating them.

The top part can be customised into a Promo Figurine or other icon and the silicone can be in multiple colours to tie in with your brand and logo.