VOLUME
23L
PACK WEIGHT
360g | 13.9oz
EXTERNAL POCKETS
HEIGHT (unrolled)
60cm | 23.6in
ULTRALIGHT WITHOUT COMPROMISE
A revolution in lightweight outdoor gear. Engineered for fastpackers and runners, the Fastus 23L is your perfect partner for ultralight adventures. Its sleek design strikes the ideal balance, offering enough volume for fast-and-light overnight trips without the excess bulk or bounce during a run.
Crafted from ultralight, advanced tough fabrics with taped seams, it’s built for long adventures. With stretch pockets with elastic cord, vest-style straps, and quick trekking pole storage, the Fastus 23L delivers versatile storage, ergonomic comfort, and trail-ready performance.
Crafted from ultralight, advanced tough fabrics with taped seams, it’s built for long adventures. With stretch pockets with elastic cord, vest-style straps, and quick trekking pole storage, the Fastus 23L delivers versatile storage, ergonomic comfort, and trail-ready performance.
THE RIGHT FEATURES
Crafted from advanced tough materials, the Fastus 23L is ready for the challenges of fastpacking. The vest-style straps with built-in stretch, featuring breathable mesh fabric and strategically placed 4mm foam over the shoulders, provide tailored comfort and flexibility. Includes a detachable webbing belt to stabilize the load and reduce pack movement.
With five pockets on the vest straps, including a zippered one, a clever bottom pocket for quick double-sided access, and multiple lashing options for your trekking poles, it’s designed for on-the-go efficiency. Its size and elegant design make it also perfect for everyday use and urban adventures, too!
With five pockets on the vest straps, including a zippered one, a clever bottom pocket for quick double-sided access, and multiple lashing options for your trekking poles, it’s designed for on-the-go efficiency. Its size and elegant design make it also perfect for everyday use and urban adventures, too!
- An ultralight, fastpacking-focused design sized for overnight missions, delivering efficient volume without excess bulk for high-intensity movement.
- Vest-style shoulder straps for dynamic stability, featuring breathable stretch mesh, wider load-spreading geometry, and targeted 4mm EVA foam padding for comfort without sacrificing airflow or flexibility.
- Integrated, quick-access storage, including five vest-strap pockets (one zippered), secure soft-flask retention with elastic ribbon, and stretch pockets with elastic cord and cord-locks for adaptable carry.
- Secure and efficient pack control, with a roll-top closure using an aluminum G-hook, 6-point side compression to stabilize loads, and a detachable 25mm webbing belt for added control when needed.
- On-the-move gear accessibility , featuring quick trekking pole storage on the vest straps or pack sides, a spacious front mesh pocket, and a dual-access bottom stretch pocket reachable from either side.
- Built for durability and conditions, available in Ultra 200X fabrics, with taped seams to enhance water resistance and seam strength for demanding terrain.
PROUDLY MADE BY HAND
Bonfus develops, tests, and produces its gear in-house, maintaining full control over every stage of the process. This hands-on approach ensures that Bonfus stands behind every product it makes and delivers consistently high-quality gear to its customers.
Each pack is meticulously inspected by Bonfus co-founder Stefania before shipment – a level of quality control that is unmatched even among cottage ultralight brands.
Each pack is meticulously inspected by Bonfus co-founder Stefania before shipment – a level of quality control that is unmatched even among cottage ultralight brands.
| SPECS | |
|---|---|
| Volume | 23L |
| Back Length | One size 16.5 in | 42 cm |
| Taped Seams |
|
| Ice Axe Loop |
|
| Quick Trekking Pole Storage |
|
| Side Compression Cord |
|
| Pockets | 5 pockets on shoulder straps (one zippered) Spacious front mesh pocket Bottom access pocket |
| Unrolled Height | 23.6 in 60 cm |
| Average Circumference | 29.5 in 75 cm |
| Pack Weight | 13.9 oz | 360 g Included webbing belt adds 35g |
| MATERIALS | |
|---|---|
| Main Body | Ultra 200X for cutting-edge durability and performance |
| Vest Style Straps | Breathable Mesh |
ADDITIONAL INFO
- Ultra 200X (130gsm | 3.85oz/sqy): Probably the most advanced pack fabric on the market. It features woven 200D UHMWPE fibers. With only a slight weight increase compared to DCF2.92, Ultra 200X offers 3× higher tear strength, 3× higher UHMWPE fiber content, and 7× the abrasion resistance. The fabric backing consists of a 0.75 mil recycled polyester film with an X-grid, making it extremely waterproof. This fabric is used as the main pack material.
- Ultra 400X (168gsm | 4.95oz/sqy): Constructed with woven 400D UHMWPE fibers and backed with a 0.75 mil recycled polyester film and X-grid for excellent waterproofing. It provides roughly twice the abrasion resistance of Ultra 200X and is used in the bottom section of the pack.
- UltraGrid (146gsm | 4.3oz/sqy): UltraGrid is woven with 210d recycled nylon yarn made from pre-consumer industrial waste. A double 5 mm 200d Ultragrid ripstop delivers exceptional tear strength and visual impact. The fabric is treated with a C0 DWR finish that contains no fluorocarbons (PFC-free) and is finished with a waterproof 1500 mm PU backing. Bluesign® approved.
Choosing the correct torso size will make your pack sit more comfortably and adapt to your back. For guidance about how to measure your torso length please refer to our guide below.
Generally, most people will have a torso length in the range 46-54cm (18″-22″).
If you fall into two pack sizes, choose the larger size. A pack that is too small will transfer too much weight to your shoulders.
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