Tangled Metal wrote:Looking for a lightweight sleeping bag for summer use on a cycle tour plus other times. Rated to +6°C with as low a weight and bulk size as possible. Also a reasonable price.
https://www.ultralightoutdoorgear.co.uk/equipment-c3/sleeping-bags-c21/sleeping-bags-c88/featherlite-sleeping-bag-p2448
Back on the OP's original question, its a personal choice on down v synthetic.
But in the quest of compactness and weigh which go hand in hand mean that sometimes I shiver and some times I sweat and both in one night.
You will find it hard to work during the day and always be comfortable, cool nights are always better, summer tends to be a fight with being draft free and not too hot, more difficult with a summer tent / tarp.
P.S. Compression bags normally come out at about 100gs.