Platypus Water Tank Replacement Reservoir Size: 2 L Width 7.5" / 19 cm Length 12" / 31 cm 4 L Width 8.25" / 21 cm Length 6 L Width 9.5 in / 24 cm Length 18" / 45.5 cm Weight: 2 L -2.7 oz / 66.4 g 4 L- 3.6 oz / 103 g