The Wildo Fold-A-Cup measures at just 2.5cm wide when folded, yet once popped open it can hold up to 250ml. Taking up a tiny amount of space and 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.FeaturesDesigned to fit inside the larger original Fold-A-Cup Big, even when it's folded Classified as a work of art by Svensk Form Copyright Panel250ml Capacity Weight: 25g Size: 9.4 x 7.2 x 2.9cmMaterial: Thermoplastic Elastomer (TPE)BPA free