Ice packs may help keep your items cool for part of their journey but it is not guaranteed to stay frozen and cold the whole time your package is in transit.
(NOTE: Ice packs take up lots of space in a box when they are frozen solid. Sometimes the use of extra ice packs results in the need for the box to be upgraded. Which can sometimes cost several dollars more in shipping. I will list an approximate amount of ice packs I can fit into a fully packed box below… if you wish to purchase extra ice packs and they cannot fit in the size box I purchase for your size order it may result in you being invoiced a few extra dollars for the upgrade. If we come across this situation while packing I will contact each customer and give you the option of getting refunded for the ice packs that will not fit or upgrading your box!)
Padded Flat Rate Envelope – none unless you only have one item.
Regional Rate A – I can typically fit 2 ice packs in a fully packed box this size.
Regional Rate B – 3 maybe 4 depending on the items in the box.
Medium Flat Rate – approximately 3.
Large Flat Rate – 4 (sometimes 5 depending on the items.)