Good under-seat bag for Strida?
Once again looking to harness the power of collective knowledge ...
I would like to have an under-saddle bag for my Strida - the kind that attaches to seat rails (and often, the post).
There is a custom Strida option, but a) it's $50 - high compared to the cost of non-custom options and b) at Areaware at least, not in stock until December.
It does seem to me that most seatbags with a seatpost strap (usually velcro) won't work that well, since the Strida seatpost is made unusually thick by the plastic clamp apparatus.
Hence my question to other Strida owners / seatbag owners - what seatbags do you know / think would work well for a Strida?
Haven't researched much myself yet other than REI. They have a small Novarra bag that could work - no seatpost attachment - but it looks like a fairly small bag.
You might try lengthening the seat tube strap by adding more hook-and-loop, thus allowing it to wrap around the Strida seat bracket. I was going to try that with an older Jandd seat bag but instead purchased a new Strida bag for $28 (not $50). I'm sure though that most under-seat bags would work with some minor modification.
After looking at some options, I believe the Strida saddle pack is just a rebranded Topeak Small Aero Wedge. It looks very very similar (see pix I attached). Of course the Topeak is about $15 (Amazon), vs the $50 list price from Areaware...
That is a small wedge (50 cu in of capacity). I'm going to try the Jandd Bike Bag, which is a bit like a very cheap Carradice (see picture).