I may pick up some week old (or two week old) Welsummer chicks soon. We will be driving quite a bit out of our way and I'm worried about getting them home. Should they be fine for a few hours in a sterilite container with lots of blankets and heat packs? Also...is there any way to sex Welsummers at that age? I am terrified of ending up with all roos from the bunch so if you could give me any suggestions on what to look for I'd really appreciate it.