Fastus 23L by Bonfus

Color: Ultra 200 X - White
31.500 kr


Ships in 1-2 business days | Based in Lombardia, Italy | Est. 2019

Engineered for fastpackers and runners, this backpack 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.

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. 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. 

Available in Ultra 200 X fabrics.

***Note: Some of the black pack images on this page are made from UltraGrid. At this time, we only carry the Fastus in Ultra 200 X.


  • Frameless 
  • Vest Style Straps: featuring vest-style straps with five pockets, including one zippered compartment. This design ensures convenient storage and quick access for soft bottles, water bottles, and other items like electronics and snacks during your journey.
  • Soft Flask Security: an elastic ribbon above the soft flask pocket secures the tip of a soft flask, preventing excessive movement and ensuring stability.
  • Stretch Pockets with Elastic Cord: stretch pockets with elastic cords and cord-locks offer versatile and secure storage options, allowing you to expand or tighten the pocket openings as needed.
  • Efficient Roll Top Closure: features an aluminum G-hook for quickly securing and compressing the roll top strap.
  • Breathable Mesh Straps: crafted with breathable mesh fabric with a slight stretch, the vest-style straps reduce sweat and move seamlessly with the body, enhanced by elastic edge binding for added comfort. The vest straps are wider than standard padded shoulder straps found in other packs; this allows the load to be spread to a wider area around the shoulders and torso, so the straps can better “hug” your body for enhanced load stability for fastpacking.
  • Strategic Foam Padding: 4mm EVA foam, placed exclusively above the shoulders on the vest-style strap, provides targeted comfort, allowing breathability and flexibility for the rest of the vest straps while further reducing weight.
  • Adjustable Sternum Straps: features two sets of sternum straps with elastic webbing, adapting to your torso’s natural expansion and contraction during breathing and movement.
  • Quick Trekking Pole Storage: enjoy quick and on-the-go storage of trekking poles on the vest-style straps or alternatively on the side of the pack for added convenience.
  • Bottom Access Pocket: the bottom of the backpack features a dual-access stretch mesh pocket, ensuring quick and easy access to essential items from both sides.
  • Spacious Front Mesh Pocket: generously sized front mesh pocket, providing additional storage for items you want to keep within easy reach.
  • Side Compression Cord: 6-point side compression cord not only stabilizes the load but also secures items, providing versatility in packing.
  • Ice Axe Loop: for those icy adventures, the built-in ice axe loop ensures you’re prepared for any terrain.
  • Webbing Belt: a 25mm detachable webbing belt is included to additionally stabilize load and reduce pack movement.
  • Taped seams: [For packs made with Ultra 200 X fabric only] Seam tape is applied to increase water resistance and increase seam strength. A pack liner is suggested to ensure pack content remains dry.



  • Volume: 23 L
  • Unrolled height: 23.6 in | 60 cm 
  • Top circumference:  29.5 in | 75 cm 

Sizing: One size. Back length: 16.5 in | 42cm 

Weight13.9 oz | 360 g (both fabric options). Webbing belt (included) adds 35g


  • Ultra 200 X Black or White (130gsm | 3.85oz/sq yd) – Probably the most advanced pack fabric on the market. It features woven 200D UHMWPE fibers. At a slight weight increase compared to DCF2.92, the Ultra 200 fabric has 3x higher tear strength, 3x higher UHMWPE fibers content, 7x the abrasion resistance. The backing of the fabric is a .75mil recycled polyester film and X-grid, that makes the fabric extremely waterproof.

Made in Mexico

***Discounts are not available on this product.

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