Designed to introduce a fun element to bars and clubs across Europe, the “Quaffer” glass allows bars to mix various drinks in equal measure with one floating on the top of the other, creating a novel drinking experience and allowing the drink to mix as it is drunk.

Developed from its original glass composition and manufactured in PET by M&H Plastics, part of rigid plastic packaging producer RPC (Rushden / UK; www.rpc-group.com), sales of the beverage container have been exceptional, the company said, with bars reporting a rise of up to 600% in sales of drinks that are suitable for the glass.

The use of PET suits the market well as it provides a glass-like quality that is safer to use, the company added. Using PET also allows the customer to easily clean and recycle it when it has reached the end of its usable life.

The container has also been developed to accommodate a snap-on cap and separator plunger, enabling a filled retail product to be marketed, whether alcohol-based or for mixed liquid condiments. A range of flavour combinations, including a healthy herbal energy drink, have been created to attract a variety of customers.