Sorry for the delay. Yes, the main bag definitely fits A4 with plenty of room. It has like a front zip pocket as well that fits A4 but it's more of a tight fit. The bag is definitely slightly bigger than the previous bags I got for him. Perfect size tbh. The main part will fit a complete change of school clothes (socks, pants, trousers, shirt, jumper). Then it has his lunch box. It will then fit his jumper, if he's not wearing it, plus a coat. He has a drinks bottle but I put that in a side pocket so it doesn't leak on his spare clothes. Then it also has its separate bag part (the bit were it's a tight fit for A4 I mentioned previously) Probably a longer answer than you wanted but I'm trying to be as clear as I can! All in all I'm very pleased with it. Excellent quality material as well, definitely not flimsy, so should hopefully last longer than his previous Spider-Man bag.