The Wildo Fold-A-Cup Big is just a mere 4cm wide when folded, yet once popped open it can hold up to 600ml of liquid.__ Taking up very little space or weight in your pack, it folds down in such a way that once emptied of liquid it won't drip over any of your gear.__Designed to fit the original Fold-A-Cup in its centre, even when it's folded Volume: 600mlWeight: 46g (1.62oz)Size: 12 x 10 x 3.9cmMaterial: Thermoplastic Elastomer (TPE)BPA free