This is what is on the lid for the totes.  Totes are long,  enough room.  They all range from sizes.  H however,  this picture was saved in this site,  that I pulled to show. 
Bedding, I use the recommended from 
TSC. However replaced it with pair towels as suggested.  
I haven't found any more chicks died during the night.  I rearranged so that heat is dispersed equally.  
That was my problem.  It wasn't reaching the other chicks.  
Heat lamps - I have two. I just purchased another.  
Imagine if you can.  Again a partisan wall, against it is 3 totes and a large dog cage containing chicks.  The heat lamps are even out to heat 2 each.  Since they are oon the ground,  the lamps are high as a kitchen counter.  Except that time , needed to have them,  the chicks,  together not apart.  
Thanks everyone for your insights.  Is much helpful and especially the bedding substitution along with the heat lamp information.  The gas fumes,  I didn't know of.