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Stackable Water Bottle & Coffee Cup
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Duet is a reusable water bottle and coffee cup designed to stack together for compact storage and easy transport. When you take your bottle, your coffee cup comes with it. The two parts can be used separately or together, depending on the drink you choose.
Many people carry a reusable water bottle but still use disposable coffee cups because carrying a separate reusable cup is inconvenient and easy to forget. Duet removes that friction by keeping a coffee cup with the bottle people already use.
Not just another reusable. Duet isn’t solving the disposable cup problem; it’s solving the reusable cup problem; forgetting it, carrying it, and cleaning it.
Designed to look just as good together as apart. Standardised cup and bottle sizes, designed to look good together, and function as you need it when apart
40% smaller footprint than carrying two separate items. Fits in standard cup holders, unlike bulkier competitors or awkward bottle designs.
After approximately 83 uses, Duet offsets the carbon cost of its production. Each refill avoids around 52 g CO₂e compared with a single use cup. (Based on typical lifecycle estimates and usage patterns).
