About: http://webisa.webdatacommons.org/205341787

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	I think many of the outdoors stores sell backpack covers that might serve your purpose, especially if you do not anticipate getting in and out of your bag too frequently while you are on land.
http://www.w3.org/ns/prov#wasQuotedFrom	fodors.com