#5 on this list
The Pulse EP50
Atom Packs
The Atom Packs The Pulse EP50 comes from a respected UK cottage workshop and is built for experienced lightweight hikers looking for refined ergonomic shaping. It fits backpackers carrying a base weight around 10 to 12 pounds who still want a reliable frame for five- to seven-day wilderness stretches. Weighing under 1.5 pounds, the Pulse EP50 achieves impressive load transfer through a lightweight carbon frame and an integrated lumbar system. It provides 54 liters of total volume (45 liters internal, 9 liters external), which offers plenty of breathing room for modern ultralight gear and food. The shoulder straps are thoughtfully sculpted to spread weight across the chest, and they come standard with integrated stretch pockets perfect for storing snacks, hydration flasks, or a satellite communicator within arm's reach. Because Atom Packs operates on a smaller production scale, availability is often constrained by batch runs, and international buyers may deal with shipping lead times. While the harness handles up to roughly 30 pounds with surprising stability, the lightweight construction offers narrow margins for error if you push beyond its intended load limits. **Highlights** - Exceptional warmth-to-weight ratio, tipping the scale at under 1.5 pounds. - Lightweight internal carbon frame provides direct load transfer to the hips. - Integrated shoulder strap pockets allow on-the-move access to flasks and electronics. - Balanced 54-liter capacity provides ample room for multi-day food carries. - Ergonomically sculpted harness reduces collarbone pressure. **Watch-outs** - Limited production availability can result in purchasing delays. - Minimal padding forgives little if overloaded past recommended weight limits.
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#6 on this list
Exos 58
Osprey
The Osprey Exos 58 is geared toward hikers stepping away from heavy traditional packs who want superior back ventilation and a proven suspension system. It is an excellent choice for backpackers tackling hot summer trails or high-humidity regions where solid-panel ultralight packs cause excessive back sweat. Osprey's AirSpeed suspension is the centerpiece of the Exos, using a tensioned mesh back panel that keeps the pack body completely off your spine, maximizing airflow. Its perimeter alloy frame provides rigid support that carries 30 to 35 pounds without sagging. Constructed from durable 100D and 400D high-tenacity nylon, the pack easily handles standard trail wear. The floating lid can be removed to shed weight, with an integrated FlapJacket cover stepping in to seal the top opening. The major drawback is its weight: at nearly 2 pounds 14 ounces, the Exos sits at the heaviest edge of the ultralight spectrum. Additionally, the curved frame that creates the ventilation gap bows the interior space inward, which can make packing rigid objects like bear canisters or square tents awkward and inefficient. **Highlights** - AirSpeed tensioned mesh suspension delivers market-leading back ventilation. - Perimeter alloy frame carries 30-to-35-pound loads with traditional stability. - Removable top lid with integrated FlapJacket cover allows modular weight savings. - Durable 100D and 400D nylon withstands heavy trail scrapes. - Widely available across retail networks with Osprey's lifetime repair support. **Watch-outs** - Heavy compared to true sub-two-pound ultralight packs. - Curved frame makes loading rigid bear canisters awkward. - Fixed, non-removable hipbelt wings can feel bulky when packing away.
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Specs side by side
| Spec | The Pulse EP50 | Exos 58 |
|---|---|---|
| Base Weight | 1 lb. 7.8 oz. (approx. 675 g) | 2 lb. 13.4 oz. (men's) / 2 lb. 11.5 oz. (women's) |
| Total Capacity | 54 L (45 L internal, 9 L external) | — |
| Frame Style | Carbon fiber internal frame with lumbar pad | Perimeter LightWire alloy frame |
| Load Rating | Comfortable up to roughly 30 lbs | — |
| Country of Origin | Handmade in the United Kingdom | — |
| Approximate Price | $314 | — |
| Capacity | — | 58 liters |
| Suspension | — | AirSpeed tensioned mesh backpanel |
| Main Fabric | — | 100D high-tenacity nylon |
| Accent Fabric | — | 400D high-tenacity nylon |
| MSRP | — | Around $285 |
What our reviewers liked and didn't
The Pulse EP50
- Sub-1.5-pound weight with an internal carbon frame
- Ergonomic shoulder straps with integrated stretch pockets
- Effective load transfer to the hips within recommended limits
- Meticulous cottage craftsmanship and clean tailoring
- Limited production batches can lead to ordering lead times
- Support degrades rapidly when loaded beyond 30 pounds
- Requires careful packing to avoid pressure points along back panel
Exos 58
- Market-leading back ventilation via the suspended AirSpeed mesh panel
- Carries 30-to-35-pound loads with rigid perimeter frame stability
- Removable floating lid allows modular weight reduction via FlapJacket
- Tough 100D and 400D nylon resists trail abrasion better than typical UL fabrics
- At nearly 2 pounds 14 ounces, it sits at the heavy end of ultralight
- Curved frame cavity makes packing rigid bear canisters awkward
- Fixed, non-removable hipbelt wings add bulk during transport
Prices change constantly — the figure shown is the last verified catalog price, and the buy buttons always go to the current listing.