This is the latest from the shop at forest Hawk, a double transport box with door mounted window cover hangers.The Forest Hawk double is very stable. It's basically two Slime Lines built into one unit. This is a good choice for anyone flying a cast of Harris hawks or two of anything.

 

Note vent at back.Each side has three vents.The outside perch key has vent holes to draw air in at the bottom.

End view showing ventilation.

Two vents on back,one on either side of center partition. Three vents per side, perch key vents and front window allow great ventilation. Optional vent fan can be added. Zero light entry!