10 Best Waterproof Deck Boxes 2026 in the United States

The TARKARI 320 Gallon Lockable Resin Deck Box is a spacious and sturdy option for anyone needing reliable outdoor storage. Its large 320-gallon capacity provides plenty of room for cushions, garden tools, pool accessories, and more, making it ideal for families or those with a lot of outdoor gear. Made from high-quality resin, this box is waterproof, UV-resistant, and designed to withstand outdoor conditions without fading or bending, which means it can last through seasons. The box also supports up to 1000 pounds, so it can double as extra seating or a small table on your patio.

In terms of security, the lockable feature adds peace of mind by helping protect your belongings from theft or curious pets. The design includes convenient built-in handles on both sides, making it easier to move when needed. Assembly is straightforward and tool-free, which is great if you want to get it set up quickly without hassle.

The black color and rectangular shape give it a simple, garden-friendly look that blends well with outdoor settings, though it might not stand out as a decorative piece if style is a high priority. While it’s labeled waterproof, like most resin boxes, heavy rain or standing water might eventually find its way inside if not properly sealed or maintained. This deck box is a practical choice for those wanting durable, large-scale outdoor storage with the bonus of seating. If you prioritize ease of use, weather resistance, and locking capability in your outdoor storage, the TARKARI deck box fits well, but if aesthetics or ultra-tight waterproofing are top concerns, you might want to look around a bit more.

The Keter Outdoor Storage Deck Box offers a spacious 150-gallon capacity, which is great for storing patio cushions, garden tools, or pool accessories, making it a solid choice for anyone needing large outdoor storage. It's made from durable resin that resists rust, fading, peeling, and dents, so it stands up well to various weather conditions and is truly waterproof. The dark grey color and solid design blend nicely with most outdoor spaces, and the box can double as a bench for two adults, adding extra utility. You can lock the lid for security, and the hydraulic pistons ensure the lid closes softly and smoothly. It's also fairly lightweight for its size at about 39 pounds, with handles that help move it when necessary.

Assembly is straightforward but might take some time due to its size. While the resin material is durable, it may not feel as sturdy as metal alternatives, and the dark color could show dirt or dust more easily. Also, the rectangular shape takes up a fair amount of space, so measure your deck area before buying. For those seeking a reliable, weatherproof storage box that combines functionality with a bench feature, this Keter model offers a practical and stylish solution.

The MAIUSCOLI 120 Gallon Waterproof Outdoor Storage Box is a solid choice if you need a spacious and durable outdoor storage solution. Made from resin with a wood grain pattern, it’s designed to handle different weather conditions without fading, rusting, or warping, which means it should last with minimal upkeep. Its 120-gallon capacity and dimensions (54" x 26.5" x 24") provide ample room for garden tools, cushions, pool accessories, and more, making it versatile for various uses around your patio or yard. The waterproof feature ensures your items stay dry even during rain.

A nice touch is the clip-together assembly, which is tool-free and simple enough for one person to manage. Built-in side handles also make moving the box easier. While it allows for a lock to be added, keep in mind that a lock is not included, so you’d need to buy one separately if security is important. The design is modern and practical but fairly straightforward, fitting in well with most outdoor styles.

This deck box provides good value through its durability, size, and ease of use, making it best suited for those who want a dependable, waterproof storage container without complicated setup or high cost.