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Ezy Storage 50L/52.8Qt Waterproof Clear Latch Tote IP-67 FBA34063 - The Home Depot
Ezy Storage Weather Proof IP65 13 Gallon Plastic Storage Bin Box w/ Lid (5 Pack) - Walmart.com
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 :
Ezy Storage Bunker tough Black 80L Large Stackable Wheeled Storage box with Lid | DIY at B&Q
Ezy Storage 18L/19Qt Waterproof Clear Latch Tote IP-67 FBA34060 - The Home Depot
Ezy Storage 18-Liter/19-Quart Waterproof Clear Gasket Tote at Menards®
Water-Proof IP67 — Ezy Storage
Amazon.com: EZY DOSE Medication Lockbox, Secure Storage for Medication and Vitamins, Combination Lock, Large Capacity, Food Safe and BPA Free : Health & Household