#8 on this list
Cloud Walker 18
CamelBak
The CamelBak Cloud Walker 18 is a clean, practical daypack tailored for hikers who want dependable hydration without technical over-engineering. Coming in well under the hundred-dollar threshold, this pack earned CleverHiker's award for the best mid-size option by focusing on the core essentials: reliable water delivery, durable exterior nylon, and a hassle-free storage cavity. Weighing around one pound empty, it is an accessible, uncomplicated trail companion. The pack features CamelBak's Crux 2.5-liter reservoir, which utilizes an easy open/close leak-proof cap and a high-flow bite valve with a shut-off lever to prevent leaks in transit. The main compartment offers ample room for a midlayer, lunch, and a compact first aid kit. Two exterior stretch side pockets easily handle trekking poles or additional standard water bottles, while a quick-access front stash zone holds wet gear. To hit its light weight and value price point, the Cloud Walker foregoes rigid frame stays, suspended mesh panels, and heavily padded hipbelts. The foam backpanel provides basic cushioning, but it will trap heat against your shirt on hot summer ascents. For moderate terrain and standard day-hiking duties, however, it delivers exceptional utility per dollar. **Highlights** - Excellent price-to-performance ratio under the hundred-dollar mark - Lightweight chassis weighs just over a pound when empty - Includes reliable 2.5-liter CamelBak Crux reservoir with leak-proof cap - Dual side stretch pockets accommodate additional bottles or gear - Straightforward, clean interior makes packing and unloading easy **Watch-outs** - Basic foam backpanel offers limited ventilation during hot climbs - Lacks a structured hipbelt to support heavier interior loads
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#9 on this list
Seral 4
Osprey
The Osprey Seral 4 offers a targeted solution for outdoor athletes who dislike the sensation of shoulder straps and sweaty backpanels. Recognized by Switchback Travel as the premier hydration waist pack, the Seral 4 places 1.5 liters of water directly over your lumbar spine. This low center of gravity keeps your upper body completely unrestricted, making it a favorite for hot-weather mountain bike laps and gravel rides. The pack includes a specialized Hydraulics lumbar reservoir featuring an extended hose that wraps around your waist and anchors to the hipbelt using a magnetic clip. Reviewers note that this magnetic dock makes grabbing a drink on smooth trail sections remarkably fluid. Osprey's AirScape backpanel uses contoured foam channels covered in mesh to prevent the pack from shifting or rolling forward under the weight of full fluids. With just 4 liters of total interior volume, gear selection requires strict discipline. Once the 1.5-liter reservoir is full, storage is limited to a multi-tool, tire levers, a tube, a phone, and a couple of energy bars. If your adventures require extra fleece layers or large medical kits, a traditional backpack remains necessary, but for quick, unencumbered rides, the Seral is exceptionally liberating. **Highlights** - Lumbar carry keeps your back completely clear and eliminates upper-body sweat - Dedicated 1.5-liter lumbar reservoir with magnetic hose retention - AirScape backpanel provides structured comfort and prevents pack slippage - Compression straps pull the water reservoir close as fluid is consumed - Dual zippered hipbelt pockets keep keys and gels instantly accessible **Watch-outs** - 4-liter cargo capacity leaves virtually no room for weather-protection gear - Drinking hose routing requires a brief learning curve compared to standard packs
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Specs side by side
| Spec | Cloud Walker 18 | Seral 4 |
|---|---|---|
| Total Capacity | 18 liters | — |
| Empty Weight | 1 lb 1.6 oz (499 g) | — |
| Included Reservoir | 2.5-liter CamelBak Crux | — |
| Suspension Type | Frameless with foam padding | — |
| Waist Belt | Removable unpadded webbing | — |
| Retail Price | Approximately $99 | — |
| Gear Capacity | — | 4 Liters |
| Reservoir Volume | — | 1.5 Liters (included) |
| Weight | — | 14.9 oz (422 g) |
| Suspension | — | AirScape lumbar backpanel |
| Hose Retention | — | Magnetic hipbelt dock |
| MSRP | — | Around $100 |
What our reviewers liked and didn't
Cloud Walker 18
- Includes a dependable 2.5-liter Crux reservoir under the hundred-dollar mark
- Lightweight frameless chassis weighs just over one pound when empty
- Durable ripstop nylon construction withstands regular trail friction
- Dual stretch side pockets accommodate extra bottles or gear securely
- Foam backpanel traps body heat during hot or steep ascents
- Webbing waist belt provides lateral stability but zero load transfer
- Main compartment can barrel against the spine if overstuffed
Seral 4
- Completely frees the back and shoulders from sweat-inducing straps
- Low center of gravity improves bike balance on technical descents
- Comes standard with a dedicated 1.5-liter lumbar reservoir and magnetic hose clip
- Dual zippered hipbelt pockets allow rapid access to trail essentials
- Cargo capacity is strictly limited once the water reservoir is full
- Magnetic hose docking requires practice to execute smoothly while moving
- Must be cinched tightly around hips to prevent movement on steep terrain
Prices change constantly — the figure shown is the last verified catalog price, and the buy buttons always go to the current listing.