Albert, I would recommend just bringing your stuff in to REI in Arcadia and figuring out what size bag(s) you need. I did this with my sleeping bag and clothes. I ended up with 3 bags I think, can't tell you what size they but you will need the size you need not what I needed. There is no real appreciable difference between the OR and Sea to Summit silnylon sacks as far as I could tell. I think the price was even the same.