Originally Posted by
fietsbob
An Issue with Road Racing (expensive, Carbon Fiber) bikes is they did not intend to have you fit racks,
But, now with the popularity of Bikepacking bags you don't need racks ,
and since the word Light was the key phrase in the topic, you won't be carrying more than will fit in them.
Another group of such equipped bikes will show up next June to race-tour each other across the country
FYA, after years of searching:
Originally Posted by
Jim from Boston
I use my carbon fiber endurance bike (Specialized S-Works) for commuting, and my best solution has been to use a seat mounted (not seatpost) Arkel 15 Liter Bikepack.
I have sufficient room to carry just about everything I need. I might add a lightweight backpack for bulky, but light items. 
Originally Posted by
Jim from Boston
You might check out this thread,“Custom Bag Makers” for this recommendation and other suggestions
Originally Posted by
Bandera
Dill Pickle Gear:
Dill Pickle Gear
The owner, who is active on BF as "Coluber42", is an experienced Randonneur and produces quality kit
Originally Posted by
Jim from Boston
I second that recommendation. I have visited her studio, and am planning to order a large saddlebag for my carbon fiber bike [without eyelets for a rack].
But before I bought a saddlebag, I discovered this product (quoted from the thread,
“Commuting with a backpack... UGH!"; See picture below.).
Originally Posted by
Jerrys88
Here is a copy of something I posted on another thread regarding the Green Guru Hauler Bike Pack:
I use one of these on my bike and really like it a lot. It has a stiff plastic insert on the bottom, so it's like a removable rack. It's expandable so it's only as long as it needs to be depending on how much stuff you have in it. It comes with a shoulder strap, so when you reach your destination it can be worn as you would a messenger bag. When I don't need to carry lots of stuff, like when I go out for lunch, I can easily remove it from my bike so I'm left with a bike that has no added weight from an attached rack.
It's very durable and waterproof and I like that it's made entirely from recycled materials. Only downside is the straps that go through the saddle rails are short, so it takes some practice inserting them, but that's a minor complaint.
Also, it only has one outside "pouch" that is a decent size 2-dimensionally, but not 3 dimensionally, if you know what I mean (It's a flat pouch. I would have designed it to have more depth). I fit my smartphone and keys in it, and could probably stuff my wallet in it, but not much else. Not a huge problem - it's quick and easy to undo the side clasps and open the main bag while it's attached to the bike.
https://www.youtube.com/watch?v=QRNyL2xftbs
I used it for about a year, but the back of my thigh did strike the bag [and the bag sways]. Now on my commutes, I wear a backpack
.[and subsequently the Arkel, as above].
Addendum: If the links to the external sites do not work, go to the quoted original Bike Forums posts, and follow the links from there.
Last edited by Jim from Boston; 10-10-18 at 07:53 AM.
Reason: added additional alternatives to the Arkel, and then added Addendum