SYR told me to go with 13x10x7, so I guess that's that LOL.

And ugh, last minute packaging question... I'm shipping a BP from warm climate to cold climate. It's 68 degrees where I am (70 inside my house), but the buyer's climate is 35 low in the early morning. I'm debating whether or not it's safe to use a heat pack, because the temp where I am is pretty much exactly on the border between should I or shouldn't I... I'm shipping to the hub and the buyer is picking up from the hub. Is using a heat pack or not using one safer?