Exped Bergen +2 Pocket Liners Olive Drab (13 Litre Pocket Liner + 140 Litre Bergen Liner + 13 Litre Pocket Liner)
The Exped Bergen Liners and Pockets are custom made for the military by Exped, the liner is 140L and the pockets are 13L in volume, which will waterproof a standard Bergen.