SlingFin Portal 3 Tent Big Agnes Sheep Mountain 4
Head-to-head comparison: specs, scores and expert verdict
SlingFin
SlingFin Portal 3 Tent
Best for: Rugged alpine adventures in harsh weather.
Big Agnes
Big Agnes Sheep Mountain 4
Best for: Versatile three-season family car camping.
Our Take
Worth flagging before you compare: the SlingFin Portal 3 Tent is a backpacking and the Big Agnes Sheep Mountain 4 is a dome, so these two sit in different shelter categories.
The Big Agnes Sheep Mountain 4 is noticeably taller inside (4'7" peak height versus 3'8"), giving you more headroom to move around.
Floor space is also wider — 66 sq ft versus 41 sq ft for the SlingFin Portal 3 Tent.
Both score 8.1 overall, though the SlingFin Portal 3 Tent wins more individual scoring categories.
The biggest gap is space and comfort, where the SlingFin Portal 3 Tent holds a clear advantage.
The Big Agnes Sheep Mountain 4 also has a price edge — $140 less at $549 versus $690.
Your best pick will come down to personal priorities, so check the full specs comparison below.
🏆 Our pick: The SlingFin Portal 3 Tent scores higher overall.
Ask our AI for a personalised recommendation based on your camping style, group size, and budget.
Score Comparison
Pros & Cons
SlingFin Portal 3 Tent
- Unmatched stability in harsh winds
- Smart internal pockets optimize organization
- Kickstand vents manage condensation flawlessly
- Relatively expensive for backpacking tents
- Clam-cleat fly tensioning is confusing
Big Agnes Sheep Mountain 4
- No footprint needed
- Eight mesh pockets
- Durable Oxford polyester
- Hefty 12-pound weight
- Stuff fly doors
Full Specs
| Spec | SlingFin Portal 3 Tent | Big Agnes Sheep Mountain 4 |
|---|---|---|
| Tent Type | Backpacking, Dome | Dome, Motorcycle, Backpacking |
| Capacity | 2 people | 2 people |
| Seasons | 3 Season | 3 Season |
| Est. Price | $690 | $550 |
| Weight | 4.2 Lbs | 11lb 13oz |
| Min Trail Weight | 3 Lbs 12 Oz | 11lb 3oz |
| Floor Area | 40.5 ft² | 66.0 ft² |
| Vestibule Area | 20.6 Sq Ft | 12ft² + 12ft² |
| Peak Height | 44 | 55 |
| Doors | 2 | 2 |
| Floor Dimensions | 92 X 68 In | — |
| Pole Material | Aluminum | Polyester Ripstop And Nylon Mesh |
| Floor Fabric | 20D Nylon Ripstop PE 1800mm | Polyester Oxford With 1500mm Waterproof Polyurethane Coating |
| Rainfly Fabric | 10D Nylon 66 Ripstop Silicone Coated (Sil/Sil) Fabric | Polyester Ripstop With 1500mm Waterproof Polyurethane Coating |
| Packed Size | 6x17 In | — |
| Setup Time | 3 5 Mins | 10 Mins |
| Warranty | Lifetime | Limited Lifetime |
| Made In | Imported | USA |
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