I am packing lunches for a ski day, and this is my current favorite bag for family lunch packing!
This is the Thirty-One Picnic Thermal Tote, and it's perfect for us because it holds 6 (SIX!!) EasyLunchboxes! Since there are 6 of us, this is obviously perfect.
The lunchboxes just stack right up in this bag, and it's got a nice little pocket on the outside if I want to included any utensils or napkins. If you don't need to pack six lunches, then you could put 4 or 5 in here and then still have room for a row of drinks on top (that's what I did last weekend). You can find it here. It currently comes in 6 different prints, and you can even customize it with a family name or monogram if you like.