Can You Put Parcel Post In Mailbox Sending "odd-shaped" Items In The Mail?

Sending "odd-shaped" items in the mail? - can you put parcel post in mailbox

I tried to send a gift wrapped in a bundle, while in a normal envelope. I was told again and did not send so strange items in envelopes and must be sent in one package JIFFYLITE stamp-97 percent. So this time I was weakening the chain in a box in a soap bubble ring land. My questions are: Do I have to be the e-mail or I can in my mailbox, sent over another?
And secondly, it takes 97 percent of postage would be good to put 39 one hundred and three stamps on them?
Thanks