Spencer, it's an alu seatpost, it will hold the weight, don't forget that the bag is also strapped on the saddle rail too.
I can't says, but medium is fine with handlebar bag/framebag, not sure if large on it's own will be enough.
I've booked a train to the Lake District between the 20th to 22nd, so I'll be riding to Wasdale to a camp site, next day walk the mountain and then the day after, ride back to Windermere to take the train home.
Spencer, it's an alu seatpost, it will hold the weight, don't forget that the bag is also strapped on the saddle rail too.
I can't says, but medium is fine with handlebar bag/framebag, not sure if large on it's own will be enough.
I've booked a train to the Lake District between the 20th to 22nd, so I'll be riding to Wasdale to a camp site, next day walk the mountain and then the day after, ride back to Windermere to take the train home.