Hyperlite Mountain Gear Unbound 40 vs Gossamer Gear Mariposa 60
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Quick take: The Gossamer Gear Mariposa 60 costs $34 less; the Gossamer Gear Mariposa 60 carries more (60 vs 40 liters); the Hyperlite Mountain Gear Unbound 40 is lighter (1.72 vs 2.16 lbs).
| Spec | Hyperlite Mountain Gear Unbound 40 | Gossamer Gear Mariposa 60 |
|---|---|---|
| Price | $349 | $315 |
| Rating | 4.6★ (250) | 4.7★ (450) |
| Type | Ultralight Pack | Ultralight Pack |
| Frame Type | Internal Frame | Internal Frame |
| Capacity | 40 L | 60 L |
| Weight | 1.72 lbs | 2.16 lbs |
| Max Load | 30 lbs | 35 lbs |
| Torso Fit | Sized S-L, 15-21 in | Sized S-L, 14.5-21.5 in |
| Material | Woven Dyneema composite | 100D/200D Robic nylon |
| Back Panel | Foam pad with removable aluminum stays | Removable sit-pad with aluminum stay |
| Adjustable torso | No | No |
| Ventilated back | No | No |
| Raincover included | No | No |
| Hipbelt pockets | Yes | Yes |
| Removable lid | No | No |
| Hydration sleeve | Yes | Yes |
| Fits BV500 bear can | No | Yes |
| Warranty | HMG limited lifetime on defects | Gossamer Gear limited lifetime |
Pros & cons
Hyperlite Mountain Gear Unbound 40
- ✓The bottom stash pocket — grab a layer or snacks without stopping — is the feature owners say they can't go back from.
- ✓Waterproof Dyneema construction means no pack liner and no wet-gear anxiety.
- ✓At 1.72 lbs with removable stays it competes with frameless packs while carrying meaningfully better.
- ✓The stretch front pocket (unlike the Southwest's solid one) swallows a soaked tent for on-the-move drying.
- ✓Made-in-Maine build quality matches its flagship siblings.
- ✓The 40L discipline forces a genuinely light kit, which converts say improved their whole system.
- ✓Clean compression lets it double as a big daypack or peak-bagging bag.
- ✓The white-and-black aesthetic carries the same HMG cachet.
- ✗40 liters plus no bear-canister fit rules out canister country and long food carries — a hard constraint, not a preference.
- ✗$349 for less volume than a $199 Flash 55 makes the per-liter math painful.
- ✗The 30 lb ceiling is firm; winter or water-heavy trips overwhelm it.
- ✗Same clammy foam-on-back feel as every HMG.
- ✗Fixed sizes, minimal try-on options, and a boxy fit — the standard HMG sizing gamble.
- ✗The stretch pocket wears faster than the Southwest's solid fabric in brush.
- ✗Hipbelt pockets remain small for big phones.
- ✗It assumes an already-dialed kit; beginners who buy the aesthetic first find it unforgiving.
Gossamer Gear Mariposa 60
- ✓The seven-pocket layout is the best organization in ultralight — fans say they touch the main compartment twice a day, morning and night.
- ✓The tall side pocket holds a full tent separately from dry gear, the single most-praised design choice.
- ✓The removable back pad doubles as a sit pad, saving carrying a separate one.
- ✓Robic nylon at 100/200 denier hits a durability sweet spot documented across thousands-of-miles reports.
- ✓Hipbelt sizing is independent of torso sizing, giving semi-custom fit from stock parts.
- ✓Carries 30-35 lbs comfortably with the stay in — honest rating per long-term reviews.
- ✓The Austin-based company's customer service and repair culture draw consistent praise.
- ✓Fits a BV500 horizontally at the top of the bag, which many 60L UL packs can't.
- ✗The asymmetric layout is polarizing — packing balanced weight takes practice and annoys symmetry-lovers.
- ✗The foam back pad ventilates poorly and soaks sweat on climbs.
- ✗The single aluminum stay twists under 35+ lb loads; it's not a heavy hauler.
- ✗Mesh pockets abrade in brush faster than solid-face rivals.
- ✗No top lid and a floppy over-the-top strap system that takes fiddling to compress well.
- ✗Fixed torso sizes with online-only sizing risk.
- ✗At $315 it's priced above the Circuit while carrying slightly worse at max load.
- ✗The hipbelt foam softens noticeably after a full thru-hike, per multiple finishers.