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Medium 3.9" Bike Seat Pack XT



(View all from Timbuk2)
SKU #: TIM1857
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About the Brand

Timbuk2 Medium 3.9" Bike Seat Pack XT

We spoke with our classic Seat Pack and asked it to create a way better version of itself. The result is the Seat Pack XT. The XT has Timbuk2's signature wide-mouth opening for quick and easy access, blinky light attachment and reflective hits for safe night riding, plus waterproof accents and a new attachment system. The bungee seat post attachment is a synch to use and the accompanying SR buckle makes it easy to attach to rails and adjust until you're comfy. You'll want to ride it everywhere.


  • Wide mouth opening for quick access
  • Adjustable S / R buckles for attaching to rails in multiple positions
  • Reflective patch on back which doubles for blinky light attachment
  • Easy and secure on-off bike attachment
  • Bungee and keeper attachment to fit multiple seat posts
  • Imported
  • Durable ballistic nylon construction
  • Waterproof nylon accents
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  • Overall Height - Top to Bottom: 3.9"
  • Overall Depth - Front to Back: 2.95"
  • Overall Product Weight: 0.33lbs

Timbuk2 Medium 3.9" Bike Seat Pack XT

Weights & Dimensions

  • Overall 3.9" H x 6.69" - 8.3" W x 2.95" D
  • Overall Height - Top to Bottom: 3.9"
  • Overall Depth - Front to Back: 2.95"
  • Overall Product Weight: 0.33lbs


Sport: BikingMaterial: Fabric
Color: 1: BlackColor: 2: Red
Color: 3: Grey / SilverCountry of Manufacture: Imported
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Timbuk2 Medium 3.9" Bike Seat Pack XT

When you buy a Timbuk2 Medium 3.9" Bike Seat Pack XT online from AllModern, we make it as easy as possible for you to find out when your product will be delivered. You can check on a delivery estimate for the Timbuk2 Part #: 859-4 here. If you have any questions about your purchase or any other Sport Bags product for sale our customer service representatives are available to help.Whether you just want to buy a Timbuk2 Medium 3.9" Bike Seat Pack XT or shop for your entire home, AllModern has all of your design needs covered.

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About the Manufacturer

Timbuk2 is more than a bag. It’s more than a brand. Timbuk2 is a bond. To its owner, a Timbuk2 bag is a dependable, everyday companion. This is the Tao of Timbuk2!

Timbuk2 has been a San Francisco original since 1989. Stitch-by-stitch, bag-by-bag, they’ve built a solid reputation and a loyal following among real-life, hard-working bicycle messengers and cycling enthusiasts. Over the years, their messenger bags emerged from their working-class roots, adopted by a growing number of urbanites, students, and young professionals as a stylish alternative to the ubiquitous two-strap daypack and the formal black briefcase.

As they move forward, Timbuk2 remains faithful to their working-class urban roots, while expanding their city-bred sensibilities to a broader range of products and a wider audience. All of their new products share the same sense of style, toughness, attention to detail and dedication to quality that have made their Classic Messenger Bag a true classic.
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Medium 3.9" Bike Seat Pack XT is also sometimes listed under the following manufacturer numbers: 859-4-1006, 859-4-2000, 859-4-2076, 859-4-6054