Going to Borovets 10th of Jan along with my 6 year old son.
Understand its a long coach transfer from airport to resort.
Do the coaches have toilets on board or do they have a stop for him to make 'yellow snow'?
Sofia to Borovets is 1 hour 15 minutes, however if Sofia and Plodvic are very foggy as was the case on 27th December then the planes all and at Burgas on the black sea coast - 6 1/2 hours away what a nightmare. Only 1 stop at a Macdonalds. don't know if there would be more stops if you were going to Borovets as the timing would'nt be so critical.
Keep your fingers crossed that the fog stays away.