Adding a rear storage box to your ATV or UTV can solve the "where do I put the helmets and gear?" problem, but the choice isn't as simple as picking the biggest bin. You're weighing a name-brand lounger, a same-name variant at a lower price, and two universal trunks with different mounting requirements. Each option makes a different trade-off between capacity, fit, and installation effort. Mounting style will influence whether you need to drill, use U-bolts, or find a rack with existing threaded holes.
Quick Take
The two Kolpin models share the same title but are separate part numbers. The MPN 4438 edition is the lowest-priced option in this group, while the MPN 4457 edition is described with a large stated capacity. The mid-priced universal lounger requires drilling, while the universal trunk with screw-on mounting sits at the top of the price range. The price spread is about $99, and the mounting story matters just as much.
Price Comparison
| Product | Listed Price | Price Bar | Capacity / Fit | Mounting note |
|---|---|---|---|---|
| Kolpin Lounger (MPN 4457) | $259.95 | 31-gallon (117-liter) capacity; fits two adult helmets | Tubular racks; custom mounting for Polaris/Can-Am | |
| Kolpin Lounger (MPN 4438) | $239.95 | Fits two adult helmets | Mounts to most tubular racks with U-bolts | |
| 82L Universal Lounger | $249.99 | 82L capacity; universal ATV fit | Requires drilling holes | |
| 75L Universal Trunk | $339.22 | Listed compatible with Argo, Honda, Kawasaki, Odes UTVs, Polaris, Suzuki, Yamaha | Screw-on mounting |
Decision Matrix
| If you value... | Choose |
|---|---|
| Lowest listed price and a Kolpin name | Kolpin Lounger (MPN 4438) |
| A stated large capacity in a Kolpin | Kolpin Lounger (MPN 4457) |
| A lower-priced universal option despite drilling | 82L Universal Lounger |
| Broad make compatibility and screw-on mounting | 75L Universal Trunk |
Product Notes
Kolpin ATV Rear Passenger Seat Cargo Storage Helmet Trunk Box Luggage Lounger (MPN 4457) - $259.95
This Kolpin lounger leans on its stated 31-gallon (117-liter) capacity and roto-molded construction. It's built to hold two adult helmets, and the seamless hinge and gutter design is meant to keep the inside dry. The limitation is the mounting notice: hardware is included for tubular-style racks only, and attaching it to a Polaris or Can-Am rack will require custom work such as drilling holes. If your ATV has a tubular rack and you want a Kolpin box with a large stated capacity, this is the one to consider.
Kolpin ATV Rear Passenger Seat Cargo Storage Helmet Trunk Box Luggage Lounger (MPN 4438) - $239.95
The lower-priced Kolpin variant (MPN 4438) is the same general design but with a different part number. It highlights an open rear that provides access to arm cavities, and it mounts to most tubular racks with four U-bolts and sealing washers. Like the other Kolpin, it carries the same Polaris/Can-Am caveat: those racks need custom mounting. If you want the Kolpin name and are comfortable with tubular-rack installation, this one gives you the same brand at a lower listed price.
82L ATV Rear Passenger Pad Seat Cargo Storage Helmet Trunk Box Luggage Lounger - $249.99
This universal lounger comes in black with an 82L capacity and is listed as a universal fit for ATVs. It's made from LLDPE material. The catch is the installation note: it requires drilling holes for mounting. It also carries a California Prop 65 warning, which is worth noting before you buy. If you're comfortable with a drill and want an 82L box at a mid-range price, this is a functional choice. The universal fit means it should work on a range of ATVs, but you'll need to measure your rack to confirm hole spacing.
75L ATV Rear Trunk Cargo Storage Box Rack Luggage Case for UTV Can-am Universal - $339.22
This universal trunk is the only option here with screw-on mounting, and it lists compatibility with Argo, Honda, Kawasaki, Odes UTVs, Polaris, Suzuki, and Yamaha. It's also the highest-priced item in this group, so cost is a real consideration. The screw-on mounting style is a standout because it doesn't rely on U-bolts or drilling. If you want a broad fitment list and prefer a screw-on mount, this is the one to pick, even with the higher price. The black finish suits most ATV and UTV looks.
Final Recommendation
If you want the lowest listed price and are fine with Kolpin's tubular-rack mounting, go with the MPN 4438. If you want a stated large capacity within the same brand, the MPN 4457 is the one. If you're after a universal fit and don't mind drilling, the 82L lounger gives you a mid-price path. And if screw-on mounting plus broad manufacturer compatibility matters most, the universal trunk is worth its higher price.
