The Chuggable Tetra: A 330ml firm Tetra prisma carton with an ergonomic eight-sided body for improved grip and robustness. Made from environmentally friendly, renewable paper with a large plastic resealable cap for easy drinking. However, none of the sportspeople on our athletes panel picked the Chuggable Tretra bottle as their favourite, with Osei describing it as “seeming too cumbersome”.