No I haven't found any issues yet. The blue sack only had light stuff in it.. Clothes, bedding stuff.. so when the Jerry can was emptied there wasn't much weight up there. I've only had a total of 6 days riding on this bike in adventure guise so the subframe hasn't really been tested for very long with luggage. Saying that we are riding fairly gnarly trails.. rocky, steep and rough for most of the ride.. plenty of bashing about and jumping around. So far so good.