Exped Waterproof Bergen Liner - 30L The Exped 30L Bergen Liner can waterproof a Bergen 100% and it is used by military. It is a waterproof and dustproof bag that keeps things dry, it works by inserting products into the bag then folding over the top and conecting the clip. Roll neck at least 3 times and clip the buckles for a water-proof seal. Made from 70 denier PU-coated taffeta nylon with fully taped seams this liner is big enough to keep everything in your pack dry and dust free whilst on the move. The bright inner PU coating lights up the interior of the bags, making it easy to find your things. Features Material: Coated 70D Taffeta nylon with a water column of 10,000 mm Capacity: 30 L /  1830 in³ 100% waterproof (not submersible) 100% dustproof. Fully taped seams. Grab handle on base. Its suggested for complete weatherproof protection, the closure of exped dry bags should be rolled at least 4 times, so advisable to consider when selecting the correct size bag you require.