PROSPECTUS SUPPLEMENT NO. 21 Filed Pursuant to Rule 424(b)(3) (To Prospectus dated January 23, 2004) Registration Statement No. 333-108544 SEALED AIR CORPORATION 6,160,708 SHARES OF COMMON STOCK This prospectus supplement relates to the offer and sale from time to time of up to 6,160,708 shares of common stock, $0.10 par value per share, of Sealed Air Corporation, a Delaware corporation, by the selling stockholders named in the prospectus dated January 23, 2004, as supplemented, and in this prospectus supplement. This prospectus supplement may only be delivered or used in connection with our prospectus dated January 23, 2004. Our common stock is traded on the New York Stock Exchange under the symbol "SEE." Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense. PROSPECTUS SUPPLEMENT DATED JULY 20, 2005 The information appearing in the following table supplements or supersedes in part the information in the table under the caption "Selling Stockholders," beginning on page 9 in our prospectus and was provided by or on behalf of the selling stockholders. COMMON STOCK COMMON STOCK COMMON STOCK TO BENEFICIALLY OWNED OFFERED IN BE BENEFICIALLY PERCENTAGE OF AS OF THIS OWNED AFTER THIS ALL COMMON NAME JULY 19, 2005 (1) PROSPECTUS (1) OFFERING (1) STOCK (2) ---- ----------------- -------------- ------------ --------- Acacia Life Insurance Company 6,571 6,571 -- -- ACIG Insurance Company (3) 14,285 14,285 -- -- Amerisure Mutual Insurance Company (3) 28,999 28,999 -- -- Blue Cross Blue Shield of Arizona 2,999 2,999 -- -- Blue Cross Blue Shield of Louisiana (3) 12,857 12,857 -- -- Blue Cross Blue Shield of Mississippi 5,857 5,857 -- -- Catholic Mutual Relief Society of America (3) 14,285 14,285 -- -- Cumberland Mutual Fire Ins. Co. 17,142 17,142 Excellus Health Plan (3) 75,714 75,714 -- -- Federated Rural Electric Insurance Exchange (3) 13,571 13,571 -- -- First Mercury Insurance Company 9,999 9,999 -- -- Founders Insurance Company (3) 2,171 2,171 -- -- Growing Oak, L.P. (Koch) 9,285 9,285 -- -- Inner Harbor Corporation (3) 12,857 12,857 -- -- Integrity Mutual Insurance Company 3,428 3,428 -- -- NCMIC 19,999 19,999 -- -- Physicians Mutual Insurance Company 16,428 16,428 -- -- The Doctor's Company (3) 37,142 37,142 -- -- Virginia Retirement System 128,571 128,571 -- -- TOTAL (4) 6,160,708 6,160,708 -- -- ________________ 1. For each selling stockholder, this number represents the number of shares of common stock that would be beneficially owned by such selling stockholder after the conversion of the Notes beneficially owned by such selling stockholder as of July 19, 2005, assumes that the selling stockholders will sell all shares of common stock offered by them under this prospectus, and further assumes that all of the Notes have been converted. 2. For each selling stockholder, this number represents the percentage of common stock that would be owned by such selling stockholder after completion of the offering, based on the number of shares of common stock outstanding as of July 19, 2005 and assuming all the Notes beneficially owned by such selling stockholder as of July 19, 2005, have been converted. 3. We have been advised that Mr. Gene T. Pretti may be deemed the beneficial owner of these shares by virtue of his voting control and investment discretion. 4. Assumes conversion of 100% of the outstanding Notes (without giving effect to any capital adjustments). We note that the aggregate number of shares of common stock requested to be registered by the selling stockholders is greater than the total number of shares initially issuable upon conversion of 100% of the outstanding Notes. This may be due in part to sales or other transfers of Notes among the selling stockholders in which the person acquiring the Notes submits a request to register shares of common stock which were previously registered by the person who sold the Notes.