A storage system is described where goods are stored in containers and the containers are stored in stacks. Above the stacks runs a grid network of tracks on which load handling devices run. The load handling devices take containers from the stacks and deposit then at alternative locations in the stacks or deposit then at stations where goods may be picked out. The containers include liners formed from flame retardant or flame suppressant material. Containers with a liner are used to store ignitable items within the storage system.