I usually carry the rope in the bottom of my pack. I am better able to compress the rope and maximize the volume of my pack without a rope bag. It is nice to have a tarp on which to lay the rope while climbing. For this I use a cheap tent footprint that I got at REI Outlet for about $4. This solution works well for me. I see the nifty rope bags from Metolius and BD as unnecessary pieces of kit that just add weight to your pack and cost $ that could be spent on beer.
Are rope bags and tarps for anal types, or are they really necessary?
I keep a small tarp in my climbing pack: -for sorting gear on sandy ground -keeping ropes clean when the base of climbs are muddy -'tempering' ropes and hardware when ice climbing (take a rope and biners from a warm car and drop them in powder, you'll do that once and remember it forever)
Does anyone make rope buckets for double ropes? I think A5 used to have one with a zipper seperating both sides but haven't seen something similar and light enough in a while.
Probably already mentioned but my friend has the Eldrid caddy and it is an excellent bag!!! It easily stores and carries his 9.4 60m rope with room left over. The main thing I like about it is how it is a cross between a shallow bucket an a tarp, making it super easy to flake out the rope and pack it up really small. It keeps your rope out of the dirt, mud, and shrubs, and it is durable and easy to use.
I don't coil my rope anymore when cragging. It sits in the bottom of my pack wrapped up in a tarp. The tarp has two tabs, each marked with sharpee: 'top', 'bottom'. I keep each end of the rope tied to one of the tabs. The top and bottom ends switch regularly, and it's very easy to tell which is which, and keeps it easy to track how many times each end has been led on or fallen on.
Tying the ends in this fashion also prevents the rope from tying knots in itself. It also is an easy way to keep the end knotted without having to think too much about it when working single pitches. If you already have a pack, don't buy a rope bag, just buy a rope tarp with tabs. I promise I don't work for a rope tarp company. I just feel that rope bags are kind of a waste of money.