Tesla Model 3 Trunk + Frunk Protection: What Actually Fits the Sedan (Not a Crossover)

The Model 3 is a sedan (this keeps mattering)

It sounds obvious, but a lot of Model 3 owners end up with cargo liners that don't fit because the "Tesla trunk liner" they bought was cut for a Model Y. The Y is a hatchback/crossover — different load floor, different wheel wells, different rear wall geometry. Model 3 is a conventional sedan trunk with a completely separate shape.

Add to that the frunk (the front trunk under the hood), which both cars have but in different shapes. Then the sub-trunk — the storage well under the main trunk floor, which Tesla quietly re-dividerized on Highland.

This is the full cargo protection guide for the Model 3 specifically, across every generation.

The three cargo areas you need to think about

1. Main trunk

The biggest cargo space on the Model 3, accessed by the rear lid. Key differences from the Model Y:

• Flatter load floor
• Narrower at the wheel wells
• Shorter load length (about 36" at the floor vs. ~40" for the Y)
• Lower opening height (sedan trunk opening vs. crossover hatch)
• Different rear wall shape — sloped toward the rear seats on the Model 3

A Model Y trunk liner in a Model 3 trunk will overhang, bunch at the wheel wells, or leave the sloped rear wall uncovered. Conversely, a Model 3 trunk liner in a Model Y will come up short at every edge.

2. Sub-trunk

Under the main trunk floor, there's a deep storage well. Tesla has changed its configuration at least three times across the Model 3's life:

• 2017–2020: Deep single well, no divider
• 2021–2023: Same well with a removable center divider
• 2024+ Highland: Revised divider geometry and a shallower main well

Sub-trunk liners need to match your specific year. Universal "fits all Model 3" sub-trunk liners don't really fit any of them correctly.

3. Frunk

The front storage area under the hood. Model 3 frunks are tub-shaped and relatively shallow compared to the Model S. They've received minor contour updates across generations:

• 2017–2020: Original frunk tub
• 2021–2023: Slightly deeper well and revised drainage channels
• 2024+ Highland: Tub revised again, with a smaller accessible volume due to refresh packaging

What to protect each area from

Main trunk

• Groceries: Leaking produce, spilled drinks, meat wrappers
• Sports gear: Wet gym clothes, muddy hiking boots, sweaty equipment
• Hauls: Boxes with sharp corners, DIY purchases (paint, bags of soil, lumber ends)
• Pets: Pet hair, drool, paw prints
• Daily wear: The floor is carpet; it absorbs everything

Sub-trunk

• Emergency gear (jumper cables, tire inflator, first aid)
• Less-frequent items (tools, extra charging adapter)
• Risk: these items scratch the sub-trunk walls, which are hard plastic and visibly scuff

Frunk

• Cold groceries (the frunk is cooler than the trunk in summer — a real benefit for ice cream runs)
• Charging cables (owners often store the mobile connector here)
• Road-trip gear (snacks, drinks that need to stay cool)
• Risk: sharp-edged items scuff the frunk tub; water from snowy outer hood drains down into the frunk well

The full-vehicle protection kit

Running full cargo protection on a Model 3 means four components:

1. Trunk floor mat (TPE, year-specific, with raised ½" edges)
2. Sub-trunk liner (year-specific, scratch-resistant)
3. Frunk liner (year-specific, with drainage)
4. Rear bumper step protector (prevents scuffing when loading heavy items)

Our full-vehicle Tesla Model 3 protection kit bundles these together with matched tooling — buying them as a bundle keeps the aesthetic consistent (same TPE color and texture across all four pieces) and saves vs. buying them separately.

The Highland sub-trunk wrinkle

If you have a 2024+ Highland, the sub-trunk divider moved. Liners cut for 2021–2023 fit the main well approximately, but don't accommodate the Highland's new divider position. If you have a Highland, make sure the sub-trunk liner is explicitly tagged for 2024+ — there's a visible shelf change that 2023-era liners don't account for. Full detail in our Highland fit guide.

The frunk drainage problem

Something Model 3 owners discover the hard way: the frunk drains aren't instant. Water that gets in (rain from loading groceries in the rain, snow from brushing off the hood, a hose from a car wash) pools in the frunk tub for an hour or more before draining. If that water contains salt, it corrodes the frunk floor liner over time.

The fix: a TPE frunk liner with its own raised edges. The TPE liner holds the water in its own tub so it can be wiped out, rather than sitting in Tesla's frunk well and corroding the metalwork.

Cargo organization add-ons (worth mentioning, not a deal-breaker)

Beyond the protection kit, a few cargo organizers are genuinely useful:

• Trunk partition / divider net: Keeps groceries from rolling around. $20–$40.
• Sub-trunk insert: Compartmentalizes the emergency gear so you can actually find things. $30–$50.
• Frunk cooler: A soft-sided cooler cut to the frunk shape. $40–$70. Keeps the frunk's natural cool benefit for longer drives.

These are nice-to-have, not essential. The core protection — trunk mat, sub-trunk liner, frunk liner — is what actually protects the cabin value.

The "sedan sag" myth

A persistent forum claim: "heavy stuff in the Model 3 trunk causes suspension sag over time." We've looked at this and there's no real evidence of premature suspension wear from normal trunk loads. Loading a full Costco run in the trunk for 5 years is well within design tolerance. What does cause visible wear is unprotected carpet under that same 5 years of loading — stains, wear-through, pet hair embedded in the weave. Trunk mats solve that problem; worrying about the suspension is solving a non-problem.

Cleaning cargo liners

Same rules as cabin mats — see our full Model 3 floor mat cleaning guide. TPE liners hose off; carpet trunk liners need vacuum + extraction.

The bottom line

The Model 3 cargo area is three separate storage zones, each with its own generation-specific geometry, each carrying its own kind of risk. Treating "the trunk" as one surface and throwing a generic liner in is the setup for the scuffed sub-trunk walls and waterlogged frunk stories that keep showing up on r/ModelY (yes, even though it's a Model 3 issue).

Do it properly once — see the full SUPER LINER Tesla Model 3 range for year-matched trunk, sub-trunk, and frunk liners designed as a set.