DS is doing his Bronze DofE expedition in the next few days.
Forecast: sunny, dry, max temps 28⁰C. Min overnight temps 16⁰C at 5am.
He did his practice in April in moderate, cloudy weather conditions. A lot of the gear has sat in a corner unused since then which is now laid back out to help him pack.
Generally for backpacking I'd leave in extra layers like woolly hats and gloves as the weight: emergency benefit is normally favourable, but presumably with these conditions it's better to take out items that won't be required and the weight will be counterbalanced by carrying additional water. The risk is more likely to be heat exhaustion than hypothermia.
We can also swap the standard sleeping bag to a much lighter, thin one that's half the weight and bulk. Normally we'd use it indoors, but the night temperatures aren't far off room temperature.
He'll still take a warm jumper (that he wears 75% of the time due to sensory issues).
He will still take waterproofs (jacket and trousers)
Does this sound like sensible adaption to the weather forecast but within DofE packing expectations? The 25% of bodyweight packing guideline is already quite tight with his build, so it seems daft to carry unnecessary additional weight in challenging weather conditions just because they're on the ticklist and useful 80% of the time.
(He will pack the rucksack himself, but I am involved in the packing process because he's autistic and needs more support and guidence than average for his age. And sometimes some pragmatic adaptable logic over routine logic... Doing the award is already stretching his skills and comfort zone and just spending 36 hours with peers is already a major act of personal development.)