Questions about this item:

The Stormshield fits either McKenzie or Fisher canoe country maps folded in quarters. It attaches to canoe thwarts and portage packs with hook and loop fastener. Granite Gear's map cases are built with heavy-duty vinyl and 210-denier nylon.
The Thunderhead is perfectly suited for attachment on Granite Gear's thwart bags, portage packs, and backpacks. Shock-corded hooks running through side sleeves allow secure attachment.
The El Nino is perfectly suited for attachment on Granite Gear's thwart bags, portage packs, and backpacks. Shock-corded hooks running from all corners allows secure attachment. The ziplock like closure guarantees your map stays dry.