NEMO Mayfly OSMO 3 Lightweight Backpacking Tent SlingFin Portal 3 Tent
Head-to-head comparison: specs, scores and expert verdict
NEMO
NEMO Mayfly OSMO 3 Lightweight Backpacking Tent
Best for: Durable, lightweight three-season backpacking.
SlingFin
SlingFin Portal 3 Tent
Best for: Rugged alpine adventures in harsh weather.
Our Take
Both are backpacking tents, so this is a direct apples-to-apples comparison.
The SlingFin Portal 3 Tent also offers significantly more vestibule space — 21 sq ft versus 9 sq ft.
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 NEMO Mayfly OSMO 3 Lightweight Backpacking Tent also has a price edge — $370 less at $319 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
NEMO Mayfly OSMO 3 Lightweight Backpacking Tent
- OSMO fabric stays tight wet
- Huge doors offer easy entry
- Axial anchors make setup simple
- Snag-prone rainfly zippers are frustrating
- Budget PU floor lacks durability
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
Full Specs
| Spec | NEMO Mayfly OSMO 3 Lightweight Backpacking Tent | SlingFin Portal 3 Tent |
|---|---|---|
| Tent Type | Backpacking | Backpacking, Dome |
| Capacity | 2 people | 2 people |
| Seasons | 3 Season | 3 Season |
| Est. Price | $320 | $690 |
| Weight | 4.1 Lbs | 4.2 Lbs |
| Min Trail Weight | — | 3 Lbs 12 Oz |
| Floor Area | 39.7 ft² | 40.5 ft² |
| Vestibule Area | 8.6 Sq Ft + 8.6 Sq Ft | 20.6 Sq Ft |
| Peak Height | 42 | 44 |
| Doors | 2 | 2 |
| Floor Dimensions | 88 X 68/62 In | 92 X 68 In |
| Pole Material | Aluminum | Aluminum |
| Floor Fabric | — | 20D Nylon Ripstop PE 1800mm |
| Rainfly Fabric | Sil/PU OSMO Poly Nylon Ripstop (1500 Mm) | 10D Nylon 66 Ripstop Silicone Coated (Sil/Sil) Fabric |
| Packed Size | — | 6x17 In |
| Setup Time | 20 Mins | 3 5 Mins |
| Warranty | Lifetime | Lifetime |
| Made In | Imported | Imported |
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