GGPeps, cold chain and the phase-change pack question

I am two hours from a pharmacy and everything I order has a long last mile, so cold chain is the thing I actually think about.

GGPeps use phase-change packs rather than gel as standard. Mine was still hard on day four, which is the first time I have opened a parcel and not immediately worried. I asked what the pack is rated to hold for and got a number rather than a shrug.

The other thing worth writing down: the customs paperwork has been right first time on four orders. That is dull and it is the difference between four days and three weeks.