Duffle bag grow box

Ok so, I made a grow box for my plants that i'll be growing soon using an old very large duffle bag, some cardboard to give it a strong frame, tin foil to line the walls and one 70watt light bulb. I know not the most conventional method but its a poor mans grow box that will only be in use for 12 days until i move the girls outside. temperature in the bag reaches up to 89 degrees. just wanted to know if you all had any suggestions on how to make sure that the bag doesn't catch fire or any ways that I can improve it. i'll post a picture a bit later

so these are grown plants or just little babys because if they are just newborns no foil should be needed. but if they are older please dont use foil use mylar becuase all tinfoil does is gives the plants burn spots

good luck man, and the tin foil will definatly get fuckin hot.

How old are you? Does mommy know that her little boy is growing pot in her house?