Father Christmas fills the sacks, about 10-12 presents/£60-80 total.
And then 1-3 presents from us, under the tree. The main present might be tech, a bike, roller skates, etc. So could be anything from about £50 to a few hundred.
We're an eco-conscious household and not averse to buying second hand gifts.
They know Father Christmas can't fit big presents on the sleigh and the elves can't make electronics or live animals. They know mum and dad buy the main presents, so expectations can be kept realistic and we can vary the budget each year. (If they ask for something over budget we will explain that, so that they aren't left devastated on Christmas morning).
This year they have both asked for Nintendo Switches but money is a little tighter than we'd like so we will look out for preloved ones on eBay.
Father Christmas is bringing them each:
board game
perplexus maze ball
couple of fidget toys
stationery
book
chocolate coins
fudge
bath bomb
plus baking bits and a band t shirt for DS (11) and craft supplies and a soft toy for DD (9)