Endurance Spider Bag P1

Assos Endurance Spider Bag P1

The Assos Endurance Spider Bag P1 is a lightweight, weather-resistant pack for riders who need extra carrying capacity on the bike without sacrificing freedom of movement. The current version features a new waterproof membrane, an increased capacity of 4 L, and a back panel that's noticeably more breathable and faster-drying than before. The signature Raw-Cut straps with their open-edge construction hug your upper body for a secure, chafe-free fit. Perfect for commuters in Zurich, gran fondo days in the Alps, or whenever you need to carry a little more on long training rides.

• 4 L of storage in a compact package for a jersey, light jacket, food, and small essentials.
• New 3-layer CORE Light membrane for reliable weather protection on the bike.
• Breathable, faster-drying back panel for a comfortable carry experience.
• Raw-Cut straps conform to your body and keep the bag securely in place.
• blackSeries colorway, One Size (OS) for a universal fit across upper body sizes.
• Thoughtful material mix: main fabric 49% PA, 35% PL, 16% EA; additional panels as per manufacturer specifications.

Technical Details and Features

The construction combines a robust, stretchy main material with the CORE Light 3-layer membrane, which shields the contents from rain and spray while staying flexible throughout. The redesigned back panel improves airflow between the bag and your back — something you'll genuinely appreciate on sweaty climbs or during the commute home on a packed train. The Raw-Cut straps lie flat, distribute pressure evenly, and work seamlessly with close-fitting road or commuter kit. Compared to the previous GT Spider Bag C2, the volume has grown to 4 L (up from 3.5 L) without losing its minimalist character. The material composition is clearly specified: main fabric 49% Polyamide, 35% Polyester, 16% Elastane; additional panels in Polyamide/Elastane and Polyester for function and durability. The one-size fit (OS) and understated blackSeries aesthetic keep things looking clean on a road, gravel, or city bike.

Use Cases and Benefits

Whether you're commuting through the city every day, tackling a long gran fondo over Alpine passes, or heading out for extended training rides — the Endurance Spider Bag P1 creates space when your jersey pockets just aren't enough. The weather-resistant membrane keeps your gear better protected in changeable Swiss conditions, while the breathable back panel wicks moisture away faster. The close-to-body fit prevents the bag from bouncing around on cobblestones or gravel, and the compact format stays out of the way even in a drop-bar position. Keep snacks, a wind jacket, gloves, or tools within easy reach without overloading your setup. If you're after a lean, bike-specific solution rather than a bulky daypack, this is a well-considered balance of protection, comfort, and minimalism.

Optional: Fit and Material Notes

The One Size design covers a wide range of body sizes, with the stretchy Raw-Cut straps handling the fine-tuning for a personalised fit. The high Polyamide and Elastane content keeps the bag's shape stable while allowing it to move with you, while Polyester panels in the back section help cut drying times. For care, a gentle hand wash or delicate machine cycle in lukewarm water followed by air drying is recommended to keep the membrane and straps performing at their best for longer. If you're regularly riding in the rain, it's worth packing electronics in dry bags for an extra layer of protection. That way, the bag works just as well on your daily ride as it does on longer tours — without having to change anything about your usual bike setup.