The 55-gallon blue rain barrel might be the best form factor for the original intent of the cache. You need just shy of 15 of them to hold the required number of seeds. Spread that over 16 barrels, and you have one barrel per 100 acre farm year. That way, each barrel will have enough empty space for educational material, like planting and growing guides, preservation techniques and a cookbook with balanced nutritional plans for the plants grown.
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