While the concept of a "soft" holding tank for grey water is a sound one, you absolutely MUST install the bag properly! Lay it flat!!! The prior owner of our 41' sailboat had an 18 1/2 gal tank 'professionally' hung on the port side and held by four screws. While Sailing in 3-6' seas and 20-25 knts the nearly full bag ripped from the top screws and started leaking into the cabin and bilge!!! I blame the installer but I question the strength and design of the eyelets. Cautiously reccomended.