I have a Selle An-Atomica on my main road bike which has Brooks-style bag loops on it.

Currently I am using a "Transit Wedge 125" from Performance (the capacity is supposedly 125 cubic inches when fully expanded). It holds what I want but doesn't mesh well with my seat post & the long rails on the An-Atomica. The loop which goes around the seat post slips upward, so the back of the bag drops down toward my rear tire. It's annoying. It doesn't matter how tight I make it, it will slip down. I put a bit of duct tape around my seat post for a while, but that wasn't a good solution.

So I was wondering... aren't there any inexpensive, cordura or equivalent, zipper-closed bags out there which can be attached via Brooks-style bag loops? I've looked at Rivbikes, et al., and what I've seen so far is either 1) very pricey, 2) too elegant, 3) a style which I don't want, or some/all of the above. The ideal bag would attach via the Brooks-style loops plus a strap around the seatpost. I'd like reasonable capacity, too... 125 cubic inches is not bad. I don't care if it borders on fredliness, because I want it to work well.

If necessary, I'll sew something onto my current bag. But it has some kind of plastic on the top, under the nylon, so it won't be easy. I figured to ask here before I start sewing, or whatever.

The one Acorn bag seemed reasonable, apart from the price. My wife would explode if she knew I spent $89 or more on a seat bag.

How about this?

https://banjobrothers.shptron.com/p/m...ag-small?pp=12

It looks fairly large, though. Velo Orange also sells these:

https://store.velo-orange.com/index.p...lebar-bag.html

But that's a totally different style so it may not be what you're looking for.

Reviving this zombie thread, because OP described my situation so exactly! Selle An-Atomica Titanico X saddle, current seatbag seatpost strap always rides up, which brings the bag forward to bump my thighs, would like a cheap bag that takes advantage of brooks-style bag-loops, not a beautiful, handcrafted, vintage-styled canvas&leather marvel.

The banjo & VO options look nice, but mid $40s I do not see as cheap.

Any other suggestions out there?

Thinking a little more about it, I am going to try hacking my current bag by getting a cheap pack of grommets from a craft store (michaels? jo-ann fabrics? walmart sewing dept?), and make 4 reinforced holes in the right places so I can just ziptie the back of the bag to the bag loops. (Fortunately in SoCal I don't need to worry about losing water resistance) Or maybe tie with shoestrings, so it's removable.