water bag

noun

a bag, sometimes made of skin, leather, etc, but in Australia usually canvas, for holding, carrying, and keeping water cool
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Examples from the Web for water bag

Medicine definitions for water bag

water bag

n.

The membranous sac filled with amniotic fluid that protects a fetus during pregnancy.bag of waters

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.