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Morning Folks.
I rode a route yesterday where I carried a bit more than usual.
I’d picked up some SH bags a while ago to experiment with and opted to go with a seatpost mounted pack over frame bag.
Whilst there wasn’t much in the way of weight in the bag it did make it rear wheel heavy.
For single pack riding is a frame mount bag best where there is a need to carry “a bit more”?
Just because everyone likes a pic …..

Well I have a handlebar bag on my gravel bike, which makes it awkward to lift over gates as the handlebars swing round and also can't do no-handers so it definitely affect the steering. Based on these two findings, I reckon you may be right that frame bag is the correct position.
Nice bike, but you need to clean that bird shit off the path.
IMO yes
I am either not a good enough rider to notice the weight bias thing or just so used to riding different bikes with different weight distributions but lower and more central is always best. On those sorts of rides I use a frame bag
Id avoid that type of bag just because it's in the line of the rear wheel spray. Frame bag will stay cleaner.
Might just be the angle of the photo but that looks like a layback seatpost and, with that amount of post showing and not exactly the longest chainstays, I'd say that your arse is already near the rear of that back. Therefore, it wouldn't surprise me if a reasonably weighty seatpack affected handling.
I tend to believe that if your bodyweight is already well centred on the bike, a seatpack won't affect handling that badly. I guess it depends what you're carrying in it too.
@scotroutes - yes, Thomson layback - that hadn’t occurred to me at all.
I’m not concerned about it getting splattered as it’s well sealed but another tick in the box for a framebag.