Intruders-Alert

I'm going to be taking the bike from New Jersey to Maine this summer for a week. I was thinking it probably would be good for me to add a luggage rack to the back rack of the bike. I already have saddlebags that I could zip on and zip off but I'm looking for some extra storage for the back. I saw this on eBay for under 60 bucks:

https://rover.ebay.com/rover/0/0/0?mpre ... 1985957072

I don't necessarily need something specifically made for motorcycles. Whatever I get is probably not going to get much use. I was even thinking about using the small storage bin that I throw in the back of my pickup.

Any suggestions?

I looked at some hard plastic cases today... it really looks kind of silly with the leather saddlebags. Can anybody suggest a leather rear luggage pack?