My DCs hate sleeping bags - they always get tied up in knots and find it hard to get comfortable.
This year I might try single duvets for them. Maybe vacuum pack them so they're tiny to pack (would be a problem the other end of the holiday though without taking my hoover....!)
Is this a crazy idea? What tog would I need if I did go for it? We are going to be in France, Loire region. We were there last year and DCs did find the nights chilly so had sleeping bags with their fleece blankets on top.