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Ezy Storage 11.4-Liter/12-Quart Waterproof Clear Gasket Tote at Menards®
Probably the most space efficient airtight (waterproof) box for 12 spools and some desiccant - "Ezy Storage 32L/33.8qt Waterproof tote". Only about 1/8" space on top remains once lid is closed :