what is the best way to pack & ship packs to PSA ?

Thanks for any advice, mostly single packs that I purchased from a long time collector and former customer, 70's football and some basketball.
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Clear Skies,
Mark
Raw: Tony Gonzalez (low #'d cards, and especially 1/1's) and Steve Young.
I have a couple packs to send in under this special, too.
Collecting 1970s Topps baseball wax, rack and cello packs, as well as PCGS graded Half Cents, Large Cents, Two Cent pieces and Three Cent Silver pieces.
FYI checkout my collector showcase of PSA graded packs
graded packs
Current obsession, all things Topps 1969 - 1972
The PSA grades also confirm that there are many totally legit packs in GAI holders, even undergraded at that, especially the earlier traded ones.
Collecting 1970s Topps baseball wax, rack and cello packs, as well as PCGS graded Half Cents, Large Cents, Two Cent pieces and Three Cent Silver pieces.