Gelert hibernation 400 sleeping bag juniors the kids gelert hibernation 400 sleeping bag is perfect for spring and summer camping trips designed with a mono fibre filling with a mummy hood zipped and shoulder baffle to help retain heat this gelert sleeping bag also has the option to be extended which increases the life of the sleeping bag completed with the gelert branding to the side kids sleeping bag left hand zip mummy shape mono fibre filling extending design w