When it comes to submersible packs and fishing bags, organization can be a challenge. With the Thunderhead Submersible Insert for lumbar packs, you’ll put an end to rummaging through piles of disorganized boxes and accessories to find what you’re looking for. Three adjustable, padded compartments provide impact protection for fly boxes and camera gear alike. Note: Not compatible with the Fishpond Small Thunderhead Submersible Lumbar Pack.