Seasonal products live a strange life: a few weeks of heavy use, eleven months in a box, then the same again. Most failures happen at the start of the second season — a pre-lit tree with a dark section, an inflatable whose blower no longer starts.
The more serious failures happen during the season. Overloaded light strings, indoor sets used outdoors, a dry tree near a heat source and costumes without flame-resistant labels are the hazards fire and consumer safety agencies publish warnings about every year.
These analyses cite that guidance first, then compare products on certification, construction and how well they survive storage.