Your ATV needs a rear storage box that can hold helmets and other gear, and two Kolpin options with the same long product name are easy to confuse. The 4457 and the 4438 both mount on the rear of an ATV, but they differ in listed capacity, access, and price. Here is how to decide between them.
Quick verdict: Choose the Kolpin 4457 if you want the larger stated capacity and padlock-ready closure. Choose the Kolpin 4438 if you prefer the lower listed price and the UV-stabilized rear-opening design. Both share the same Polaris/Can-Am mounting caveat, so check your rack before you buy.
| Attribute | Kolpin 4457 | Kolpin 4438 |
|---|---|---|
| Listed price | USD 259.95 | USD 239.95 |
| MPN | 4457 | 4438 |
| Stated capacity | 31 gallons (117 liters) | 3.5 cubic feet |
| Construction | Roto-molded, made in USA with global materials | Heavy-duty rotomolded, UV-stabilized LLDPE |
| Closure | Heavy-duty rubber draw latches, integrated padlock holes | Opens in rear with access to arm cavities |
| Seating | Removable no-slip seat pads | Described as a lounger with easy storage access |
Where the 4457 wins: The 4457 lists a bigger capacity at 31 gallons (117 liters) and says it fits two full-size adult helmets. It also adds heavy-duty rubber draw latches, integrated padlock holes, and removable no-slip seat pads, so it is the stronger choice if you want locking security and a cushioned seat surface.
Where the 4438 wins: The 4438 is the less expensive of the two and emphasizes a rear-opening design with access to arm cavities. Its construction is described as heavy-duty rotomolded, UV-stabilized LLDPE, and it accommodates up to two adult helmets or other large items while doubling as a lounger. If you want UV-stabilized material and rear access, this is the one.
Kolpin ATV Rear Passenger Seat Cargo Storage Helmet Trunk Box Luggage Lounger (4457)
At $259.95, the 4457 is the higher-priced of the two Kolpin boxes. Its description highlights a 31-gallon (117-liter) capacity, enough for two full-size adult helmets, and a seamless hinge and gutter design that keeps the inside dry and dust free. The closure uses heavy-duty rubber draw latches with integrated padlock holes, and the removable no-slip seat pads make the top usable as a seat. The included mounting hardware is designed for tubular style racks; attaching to a Polaris- or Can-Am-style rack may require custom mounting. Choose the 4457 when the larger stated volume and padlock-ready security are your priorities.
Kolpin ATV Rear Passenger Seat Cargo Storage Helmet Trunk Box Luggage Lounger (4438)
Priced at $239.95, the 4438 is the lower-priced pick. It is described as a perfect lounger with easy storage access and accommodates up to two adult helmets or other large items. Its construction is heavy-duty rotomolded, UV-stabilized linear low-density polyethylene (LLDPE), and it opens in the rear to access the arm cavities. Mounting uses four U-bolts and sealing washers for most tubular racks, with the same Polaris/Can-Am custom-mounting caveat as the 4457. If the $20 price difference matters to you and you prefer UV-stabilized LLDPE plus rear-opening access, the 4438 is a solid fit.
Final choice by use case: If your main need is a two-helmet rear box with a large stated capacity and the ability to padlock the lid, go with the Kolpin 4457. If you want the lower listed price, a rear-opening design, and UV-stabilized LLDPE construction, the Kolpin 4438 is the better match. Both require checking your rack type first, since the included hardware targets tubular racks and Polaris/Can-Am installations may need custom mounting.
