Swiss innovators Sigg have designed the perfect bottle for brewing hot or cold tea at home: it’s simple to use, insulated with a double wall to keep your drink at the perfect temperature, and completely leak-proof. For cold brew, the process is simple: just fill the infuser with loose leaf, fit it back into the bottle, pour an inch or so of boiling water into the bottle and invert twice. You can then top it up with cold water, screw the lid back on and pop it in the fridge overnight. We also love it as an on-the-go flask for hot tea: just brew as you normally would, remove the infuser and pop it in your bag. (It also fits in most car cup-holders.) We love it for cold brewing our Summer Pudding tea â€“ what’s your favourite brew? Height: 26.5cm Diameter: 6.5cm Capacity: 400ml Care instructions: Hand wash only. Clean all parts in hot soapy water with a soft cloth, rinse thoroughly and turn upside down to dry. Do not use harsh chemicals or abrasives, only mild detergent.