ORDER

The memorandum filed on October 24, 1994 is redesignated as an authored opinion.

OPINION

Sea-Land Service, Inc. (“Sea-Land”) appeals the district court’s grant of summary judgment in favor of Konica Business Machines (“Konica”) in Konica’s admiralty action pursuant to 28 U.S.C. § 1333 to recover damages for cargo lost overboard by the vessel Sea-Land Consumer during a voyage from Yokohama, Japan to Long Beach, California in 1991 on which the Konica cargo was stored in a container above deck. Sea-Land argues that the district court erred in ruling that: (1) Konica was entitled to expect below-deck storage under Ingersoll Mill. Mach. Co. v. M/V Bodena, 829 F.2d 293, 299 (2d Cir.1987), cert. denied, 484 U.S. 1042 , 108 S.Ct. 774 , 98 L.Ed.2d 860 (1988) and St. Johns N.F. Shipping Corp. v. S.A. Companhia Geral Commercial do Rio de Janeiro, 263 U.S. 119, 124 , 44 S.Ct. 30, 31 , 68 L.Ed. 201 (1923), where the bill of lading issued by Sea-Land did not contain a statement that the stowage option had been exercised in favor of above-deck storage; and (2) Sea-Land failed to present admissible, relevant evidence of an agreement permitting the cargo to be stowed on deck or of a port custom of above-deck stowage and therefore failed to overcome the presumption that below-deck *315 stowage was required. We have jurisdiction over this timely appeal pursuant to 28 U.S.C. § 1291 , review de novo, F.D.I.C. v. O’Melveny & Myers, 969 F.2d 744 , 747 (9th Cir.1992), rev’d on other grounds, — U.S. -, 114 S.Ct. 2048 , 129 L.Ed.2d 67 (1994), and reverse and remand.

I.

The undisputed facts are as follows: Koni-ca and Sea-Land entered into a written contract for the carriage of Konica’s cargo from Yokohama, Japan to Long Beach, California. This contract of carriage was evidenced by Bill of Lading No. SEAU937875313 issued by defendant Sea-Land and dated November 10, 1991. The bill, as issued, did not contain a statement by Sea-Land that the stowage option retained therein had been exercised in favor of above-deck stowage.

On or about November 12, 1991, in Yokohama, Japan, Sea-Land received from Roñi-ca container No. SEAU5299161 (“the container”), said to contain Konica’s cargo, for carriage by sea aboard Sea-Land’s vessel, the Sea-Land Consumer. Konica’s cargo consisted of 44 electrostatic copying machines which were stored within the container. The container fell overboard into the North Pacific Ocean during the voyage, and Sea-Land failed to deliver the cargo to Long Beach.

Konica filed suit on November 22, 1991, and an amended complaint with leave of court on September 14,1992. The complaint sought money damages for the loss of the cargo in the amount of $230,028.48, the alleged value of the cargo at the time of the loss. Konica filed a motion for summary judgment on December 4, 1992, and the district court granted the motion and entered judgment by order filed February 25, 1993. This appeal followed.

II.

In St. Johns N.F. Shipping Corp. v. S.A. Companhia Geral Commercial do Rio de Janeiro, 263 U.S. 119 , 44 S.Ct. 30 , 68 L.Ed. 201 (1923), the U.S. Supreme Court held that where a contract of carriage provided for shipment of rosin on or under deck, at ship’s option, subject to the terms of the bill of lading, in the absence of a port custom permitting above deck stowage, notwithstanding a clean bill, the issuance of a clean bill of lading amounted to a declaration that the option had been exercised and the goods would go under deck, and the ship is hable as for a deviation for loss by jettison caused by an on deck stowage.

The St Johns court did note two exceptions to the general rule of unreasonable deviation, however, and stated:

Id. Evidence of a custom in the trade is also an exception to the general rule. See, e.g., Thomas J. Schoenbaum, Admiralty and Maritime Law § 9-16, at 323 (1987); 2 Raoul Colinvaux, Carver’s Carriage By Sea 858 (13th ed. 1982) (“Goods ought not to be carried on deck ... unless a custom to carry in that way exists in the particular trade”).

Sea-Land argues that the affidavit of Carol Berger, Sea-Land’s own Senior Manager of South Pacific Vessel Operations in Long Beach, submitted in opposition to Konica’s motion below is sufficient to raise a genuine issue of material fact as to port custom or general usage of the trade so as to prevent the entry of summary judgment. We agree. The Berger affidavit states:

The affidavit was at least sufficient to establish a dispute as to the existence of either a port or trade custom.

*316 III.

Sea-Land also argues that given the modern prevalence of containerized shipment, on deck stowage should not be considered an unreasonable deviation, and cites to Du Pont de Nemours International S.A. v. S.S. Mormacvega, 493 F.2d 97 (2d Cir.1974), where the Second Circuit recognized technological innovation and changes in vessel design and upheld the district court’s finding that on deck stowage was a reasonable deviation. The Mormacvega court recognized that while a clean bill of lading imports below deck stowage, nevertheless stowage elsewhere will be held to be an unreasonable deviation only when a ship’s hold is the ordinary and contemplated stowage area. Id. at 103 .

Konica argues that pursuant to Constructores Tecnicos, S. de R.L. v. Sea-Land Service, Inc., 945 F.2d 841 (5th Cir.1981), the deviation was unreasonable. Constructores is readily distinguishable, however, as the cargo in that case was stored in an open “flat rack” container.

The Mormacvega decision is well-reasoned and its rationale is convincing; however, unlike the present case, the Mormacvega court had the benefit of specific findings by the district court based upon a thorough record created at trial by the parties. In the present case, although we might be inclined to follow the Mormacvega rationale based upon our own general knowledge of shipping developments over the years, that general knowledge is not a substitute for an adequate record before the trial court.

The judgment of the district court is REVERSED and the cause is REMANDED for further proceedings consistent with this decision.