Which sleeping bag for an October Camino?

Sleeping bag for the Camino de Santiago

The question was:

I’ll be setting off from St Jean on 1 October. I’ve got a silk liner but I suppose I’ll also need a sleeping bag at this time of year. I only have a 36l Osprey Stratos backpack so I’d need a compact bag. I don’t want to spend too much and wondered if a basic, lightweight 1/2 season sleeping bag would be OK?

Read the conversation on what sleeping bag is good for walking the Camino de Santiago in October.