Adding straps to bottom of pack..or recommendation

So I'm in the market for a small overnight pack. I have found several I'm interested in but quite a few of them do not have straps on the very bottom of the pack. I'm not quite sure if I absolutely need them yet as I haven't decided on a pack. However, just in case.....Is there any person/company that I could ship a pack off to to have some professionally sewn/attached to the pack?

I'm assuming the fabric of the pack will be a big factor on how hard it is or what to use to attach...but any DIY'rs out there willing to do this for a little $$ if needed?

Or...if you guys have a nice suggestion for a overnight+ pack that i can 'fast-pack' with? Looking to start getting into doing some overnight trail running and finding a pack that will be able to be sinched enough to not bounce, lightweight, and to have some of my "picky" important features is quite the challenge.

With an internal frame pack, it's far better not to attach anything to the outside of the pack, other than in the pockets. It will pull the pack off-balance, catch on brush, etc. Better either to reduce the volume of your gear or get a pack the right size to contain it all.

Check the articles on the home page of this site, left hand column, for ideas.

Yea, I'm not entirely sure i'll need it anyway. basically was just going to have it hold my windblock for bottom of my hammock...which is essentially just almost like a groundcloth for a tent. Not much volume or weight to it, just was going to 'stick it there' if need be.