DromLite Bag

These DromLite™ Bags from MSR hold larger volumes of water, but also collapse down extremely small when not in use and are carried inside of a backpack. Details Compactible Water Storage Bags Lightweight Durable PU Film Construction RF-Welded Seams 3-in-1 Cap:  Fill, Drink, Pour Folds Down to the size of the cap Elastic Bungee Cord Hang and Carry Loop BPA-Free Assembled in USA of U.S. and Imported Materials     2 Liter 4 Liter Weight 4.6 oz (0.13 kg) 5.1 oz (0.15 kg) Width 8.5 in (21.6 cm) 10 in (25.4 cm) Length 15.6 in (39.6 cm) 18.3 in (46.5 cm)