Mudlust – Half Framebag

Rated 5.00 out of 5 based on 5 customer ratings
(5 customer reviews)


Framebag ordering is on pause to ensure all customers receive their gear before the Arizona Trail Race (April 5th). The Rockgeist workshop will be closed for the duration of the race and ordering will resume approximately April 17th. Thank you for your patience.

SKU: FLY10V Categories: ,


The Mudlust half framebag is a partial frame bag designed around the water bottles that live in your inner triangle space and does not connect to the full length of your down tube. Quality materials are used inside and out. X-Pac™ or Cordura® is used for the outer and inner fabric and Ballistic Cordura® is used on the spine where the bag touches the frame. For framebags built from multiple COLORplease select them here

Base features:

  • Variable top tube velcro attachment to accommodate your choice of stem bag (e.g., the Cache top tube bag)
  • Drive-side main zippered compartment giving access to entire bag
  • Hydration/electronics port
  • Reinforced velcro connections with weatherproof webbing
  • Molded zippers


PhotoFit™ Template Creation: A strategic photo of your bike is used to build all Rockgeist framebags. PhotoFit™ offers several advantages over physical customer-traced templates. The most important advantage is that it eliminates template errors and helps avoid zipper stress, maximizing packing efficiency, and ensures strap compatibility with existing bags/frame features.

Additional information

Standard Spine Width


Body Color

1000d Cordura Blaze Orange, 1000d Cordura DigiCam, 1000d Cordura Forest Green, 1000d Cordura Navy Blue, 1000d Cordura Woodland Camo, 500d Cordura Alpine MultiCam, 500d Cordura Black, 500d Cordura Desert Tan, 500d Cordura DigiCam, 500d Cordura Duke Blue, 500d Cordura Everglade, 500d Cordura Hot Pink, 500d Cordura Navy Blue, 500d Cordura Purple, 500d Cordura Red, 500d Cordura Turtle Green, Multiple Colors – See Link in Product Description, VX21 Bahama Blue, VX21 Black, VX21 Navy Blue, VX21 Purple, VX21 Red, VX21 Stone Grey, VX21 Teal, VX21 Yellow, VX21-RS Black, VX21-RS Cobalt Blue, VX21-RS Frost Teal, VX25 Blaze Orange – UV optimized, VX42 Black, VX42 White, X33 Army MultiCam, X42HS Olive, X50 Black MultiCam, X50 Tropic MultiCam

5 reviews for Mudlust – Half Framebag

  1. Rated 5 out of 5


    My Flyrock has been on my daily commuter (cross check) for two years. It’s perfect for my phone, chain lock, tube kit, gloves, ultralight rain shell, multi tool, and a burrito. The construction is flawless and it still looks brand new. Greg has made the ordering process simple and the directions are easy to follow.

  2. Rated 5 out of 5


    I bought this bag earlier in the summer and never leave home without it. It works for commuting to work, running errands around town, and (obviously) touring.

    The construction is solid and it fits perfectly to my frame. Off-the-shelf products are too small for my frame (61cm), and they rarely fit a normal size bike anyway. Spend the few extra dollars for something custom, it’s worth it.

    Greg was super helpful and accommodating through the whole process. I live in Canada and tried to time things so the bag would ship to my parents in the US and I could save some money. When the bag wasn’t ready in time (no one’s fault, I was overly optimistic), Greg shipped it to Canada and didn’t charge anything extra for international shipping. I did get hit with a the border tax, but there is no way around that.

    Here’s a pic of the bag in action:

  3. Rated 5 out of 5

    Jon (verified owner)

    All of the off the shelf framebags didn’t seem to be a great fit for either by crossbike or my mtb. When I found Rockgeist and the easy way you can order custom fit bags for your bike I went for it. I couldn’t be more pleased. They are a perfect fit and are heavy duty (yet light) construction. They fit all of my tools, spares, water filter kit, extra water, and most importantly, my flask. There is room to spare….and with the extra zipper on the other side, I can fit my phone, maps, pen, etc. They look great and complement my bikes.

    The other very cool part about this is the experience of working with Greg and buying a very high quality product from a small business. I sent in some photos of my bikes, Greg gave some feedback on what would work and what wouldn’t and we came to a decision together. It’s nice knowing I had a hand in this too!

    Last, you would think custom anything made in America would be pricey. I thought the cost was very reasonable and not a lot more than an off the shelf product.

  4. Rated 5 out of 5

    Mason (verified owner)

    I recently switched frames, and my Apidura bags didn’t fit quite right on my new hardtail. I ordered custom Mudlust, Medic top tube (saddle side), and Cache top tube bags from Greg. I had been through a few other shops that either never returned my email, or kept my templates for months without ever looking at them. I’m so glad they didn’t work out, because the process and results with Greg and Rockgeist have been even better than advertised. I can’t believe how easy the template photo process was, and how well it worked. My framebag just cannot fit any better. It’s perfect, and even more sturdy and durable than I expected. I hoped they would be as well made as the Apidura frame bag, but the Rockgeist quality blows the Apidura out of the water. The zippers, padding, and fit & finish is the best I’ve seen. I will absolutely be ordering the Foxglove saddlebag and Barjam harness now that I know how great this stuff is.

  5. Rated 5 out of 5

    Nate (verified owner)

    Cannot recommend these bags enough. Greg is always very receptive to feedback on how the bag will be used and how that’ll shape its construction. These custom bags go deeper than picking a color and tracing an outline. Everything is meticulously designed and sewn to provide the best user experience. I have two of these Mudlust bags on mountain bikes that are filling the front 10″ or so of the front triangles. Perfect size for carrying all the tools you’d normally keep in a Camelback.

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