The thermo bonding on these balls hasn't shown a single weak seam after three hard training sessions, and the duffle easily held my full kit plus a few extra balls. The grip is noticeably tackier than my old match balls, which makes receiving long passes feel much more controlled.
The duffle bag is generous, easily swallowing all four balls plus my shin guards and a water bottle. The thermo-bonded finish holds up well on grass, though I did notice a few scuffs after a couple of hard training sessions on turf.