Gregory Nano 18 vs Gregory Terros 25
Quick take: The Gregory Nano 18 costs $20 less; the Gregory Terros 25 carries more (25 vs 18 liters); the Gregory Nano 18 is lighter (1.06 vs 1.82 lbs).
Which one to buy
$20 apart, both one size and neither with a real frame, these are Gregory's two cheapest packs, and they suit different days. The Nano 18 is the light, simple one: 1.06 lb, a perforated foam back that lets some air move, and a hydration sleeve. The Terros 25 is the heavier, tougher one: 1.82 lb, 7 L more, a padded back with no ventilation, and 500D x 600D recycled polyester over a 900D base.
The Nano is a leave-it-by-the-door pack that works for commuting and trail days alike, and at its weight you barely notice it empty. Its only structure is the foam pad and its waist strap is minimal webbing, so it's happiest with light loads riding on your shoulders, even though Gregory rates it to 20 lb, the same as the Terros.
The Terros earns its extra $20 and 0.76 lb if you need room for layers and lunch on longer days, or you want the heaviest fabric in Gregory's daypack range. It's new as of June 2026, though, and Gregory files it as an urban pack with thin trail features: no hydration sleeve and no rain cover. For short hikes and daily carry, the Nano does the job for less, and on both packs snacks ride in the bag rather than on the belt.
Gregory Nano 18
For short hikes and daily carry where light weight and a hydration sleeve matter more than extra room or heavy fabric.
Gregory Terros 25
Worth the extra $20 if you want 25 L for longer days or a pack built from much heavier fabric for rough daily use.
| Spec | Gregory Nano 18 | Gregory Terros 25 |
|---|---|---|
| Price | $80 | $100 |
| Rating | — | — |
| Type | Daypack | Daypack |
| Frame Type | Frameless | Frameless |
| Capacity | 18 L | 25 L |
| Weight | 1.06 lbs | 1.82 lbs |
| Max Load | 20 lbs | 20 lbs (9.1 kg) |
| Torso Fit | One size (fits 14-21 in torsos) | One size |
| Material | 210D high-density 40% recycled nylon with 450D 100% recycled polyester | 500D x 600D 100% recycled polyester with C0 DWR, 900D recycled polyester base |
| Back Panel | Perforated CLPE foam | Padded contact back panel |
| Adjustable torso | No | No |
| Ventilated back | Yes | No |
| Raincover included | No | No |
| Hipbelt pockets | No | No |
| Removable lid | No | No |
| Hydration sleeve | Yes | No |
| Fits BV500 bear can | No | No |
| Warranty | Limited lifetime warranty against defects in materials and workmanship, original purchaser | Gregory lifetime warranty |
Pros & cons
Gregory Nano 18
- ✓$80 with 450D recycled polyester panels alongside the 210D body is unusual value; most packs this cheap use one thin fabric throughout.
- ✓17 oz is genuinely light for a pack with real fabric rather than ultralight nylon.
- ✓The 210D high-density body is 40% recycled nylon, with PFAS-free DWR on the polyester panels.
- ✓Perforated CLPE foam gives some airflow without the bulk of a suspended panel.
- ✓Gregory's lifetime warranty applies even at this price point.
- ✓Simple enough to work as a commuter pack as well as on trail.
- ✓Less than half the price of the Arc'teryx Aerios 18 at the same volume.
- ✓Widely available at mainstream retail.
- ✗No frame or framesheet; the foam pad is the only structure.
- ✗18 L is small for a full day in variable weather.
- ✗No hipbelt pockets and only a minimal waist strap.
- ✗Perforated foam ventilates far less than a suspended mesh panel.
- ✗No rain cover included.
- ✗One size only, with no torso adjustment.
- ✗Basic feature set compared with the Zulu 24 LT at $90 more.
Gregory Terros 25
- ✓One of the cheapest current Gregory packs, $10 under the Arrio 22 and $20 under the Kiro 24.
- ✓500D x 600D polyester body over a 900D base is far heavier cloth than the 210D on Gregory's lighter daypacks.
- ✓Fully recycled fabric with a PFAS-free C0 DWR.
- ✓Three sizes, 20 to 28 L, at $89.95 to $109.95.
- ✓Lifetime warranty applies, the same as on the $370 Baltoro.
- ✗Frameless, so the 20 lb ceiling is a hard limit, even though it tops the framed Arrio's 15 lb.
- ✗Padded foam back without ventilation, where the Arrio gets FreeSpan suspended mesh and the Zulu LT gets VaporSpan.
- ✗Gregory lists it under urban backpacks, so trail features are thin.
- ✗New in June 2026 with no track record.
- ✗1.82 lb is heavier than the equally frameless Kiro 24 at 1.54 lb, despite the Terros being the simpler pack.
Gregory Nano 18 vs Gregory Terros 25: common questions
Is the Terros 25 worth $20 more than the Nano 18?▾
If you need the extra 7 L or want heavier fabric, yes. Otherwise the Nano weighs 0.76 lb less and has a hydration sleeve, and it suits commuting and short trail days equally well.
Which one carries a heavier load better?▾
The Terros 25, on build rather than rating: both are rated to 20 lb, but the Terros has a padded back, while the Nano's only structure is a perforated foam pad with a minimal waist strap, so it's happiest with light day loads.