The value pick: a plastic dock bench box with a 10-year warranty for a fraction of fiberglass prices.
Lifetime $314.99The Lifetime Marine Dock Box 130 gal rates 4.2 among 18 cu ft and up dock boxs; the DoxBox Fiberglass Triangle rates 3.0 among under 18 cu ft ones. The Lifetime Marine Dock Box 130 gal costs $384.01 less ($314.99 vs $699).
Prices were last checked November 9, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.

A fiberglass corner box with vents and soft-close arms, for less than Taylor Made’s corner model.
Amazon $699Scores side by side
These two sit in different size classes (18 cu ft and up and under 18 cu ft), and each is scored against the reference points for its own class, so a rating says how well each does among its own size peers. How we rank explains each factor.
| Factor weight | Lifetime Marine Dock Box 130 gal | DoxBox Fiberglass Triangle |
|---|---|---|
| Overall rating | 4.2/5 | 3.0/5 |
| Value 30% | 100 $14.25 per cu ft ($314.99, 22.1 cu ft) | 33 $53.36 per cu ft ($699, 13.1 cu ft) |
| Size 15% | 59 22.1 cu ft exterior volume | 21 13.1 cu ft exterior volume |
| Build 20% | 44 polyethylene, UV-resistant finish | 80 fiberglass, UV-resistant finish |
| Features 20% | 70 spring-hinge lid, lockable latch, lid rated as a seat, tie-down points | 65 gas lid supports, lockable latch, vents |
| Warranty 15% | 100 10-year warranty | 0 warranty not published, scored as none |
Specifications
| Lifetime Marine Dock Box 130 gal | DoxBox Fiberglass Triangle | |
|---|---|---|
| Size | ||
| Exterior (W x D x H) | 60 x 24 x 26.5 in | 54 x 24 x 35 in |
| Shape | Rectangle | Triangle |
| Style | Bench | Corner |
| Exterior volume | 22.1 cu ft | 13.1 cu ft |
| Interior | 57 x 20.7 x 23.7 in | - |
| Stated capacity (not scored) | 130 gal | - |
| Stated load rating (not scored) | 900 lb | - |
| Build | ||
| Material | Polyethylene | Fiberglass |
| UV-resistant finish | Yes | Yes |
| Made in USA | - | Yes |
| Features | ||
| Lid support | Spring hinge | Gas supports |
| Lockable | Yes | Yes |
| Seat-rated lid | Yes | - |
| Vents | - | Yes |
| Tie-down points | Yes | - |
| Ownership | ||
| Warranty | 10 years | - |