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: 600ml Weight: 46g (1.62oz) Size: 12 x 10 x 3.9cm Material: Thermoplastic Elastomer (TPE) BPA free