The temperature ratings on sleeping bags are indeed a challenge! What I have found that works well is taking an insulating layer for both top and bottom, that way if the temps are cooler you an wear either one piece or two. It's also something fairly light to carry if you are backpacking or riding self contained. And as always, it can double for simply sitting around the campsite.

Hope the weather forecast is cooler than last weekend Catrin! It's too bad that we didn't live closer; we are about to do an overnight mtb trip going self contained.

Jackie
http://chasecyclery.blogspot.com