FatSac W705-GRAY Center Locker Rear Seat Ballast Bag 650 lbs Gray

The FatSac W705-GRAY Center Locker / Rear Seat Sac is a highly versatile wakeboard boat ballast bag designed to fit in the center locker of V-drive boats or replace the rear seat cushion in direct drive inboard wakeboard boats. Measuring 62" L x 26" W x 10" H, this bag delivers up to 650 lbs of added ballast to help you dial in the perfect wake or surf wave.

Its low-profile design allows it to slip into tight spaces — including center lockers, under-seat storage compartments, or directly in place of the rear seat — without sacrificing ballast capacity. Despite its slim profile, the bag's generous length and width maximize water displacement for serious ballast weight. Thanks to FatSac's durable, proprietary layered vinyl construction, the bag is strong enough that sitting, standing, or walking on it during use is perfectly fine.

Key Features:

• Dimensions: 62" L x 26" W x 10" H
• 650 lbs ballast capacity at recommended fill
• Four-port design — includes all fittings for use with FatSac Supa Tsunami Pump (W709-SUPA, sold separately)
• Includes fittings: 2x W731, 1x W749, 1x W730
• Compatible with FatSac Supa Tsunami Pump with no conversion parts needed
• Proprietary layered vinyl material engineered specifically for ballast use
• UV stabilized for long-term sun exposure resistance
• Gray standard color; custom colors (Blue, Red, White, Camo) available at an additional charge
• Made in the USA

The W705-GRAY is an ideal solution for wakeboarders and wakesurfers looking to maximize ballast placement flexibility. Trusted by world-class boat manufacturers including Nautique, Moomba/Supra, and Malibu/Axis.