Answer:
Upon your lonely journey I accompany you, whether you travel through endless mountains or seas of blue. Wherever you go, I keep your place. Lost you're not, when I'm embraced. What am I?
I contain five little items of an everyday sort. You can find all five in a tennis court.
The more you take the more you leave behind. What am I?
I have fangs and enjoy piecing holes with a single bite.
It rows quickly with four oars but never comes out from under its own roof. What is it?
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.