I've got a problem. Well not a problem, but I'm thinking about something: What if I split my BOB into 2 parts?

I buy a hip-pack and put the essential items in there. The other ''non-essential'' stuff (extra food,clothing,etc.) I keep in the backpack.

The advantages that I see: If back-pack is lost or has to be ditched, I still got the most important equipment in the hip-pack.
I can also use the survival-hip-pack for day-hikes. (back-pack is to large for that. And of course I can use the space in the back-pack
that is free for other non essential BOB-stuff.

What are your thoughts on this?