According to new research, 80% of us do, costing airline passengers £619m a year. So what’s the secret to good packing" 
If you’re planning on going away this October half term, you might want to rethink your packing strategies. According to research by MyVoucherCodes, disorganised families in the capital overpack their luggage, with four in 10 people having to pay extra charges ? nearly £45 per person, on average.
The most common items that went unused while on holiday included excess toiletries (36%), books (27%), board games (21%) and extra pairs of shoes (18%).
According to the survey, most of us are likely to fold our clothes rather than roll them (69%) and we’re also likely to forget to check the facilities and weather forecast at our destination, both of which lead to unnecessary items being packed and therefore going over the weight limit. So what is the secret to the art of good packing" 
1. Write a list beforehand

More than 80% of us admit to packing too many items for our holidays. Get organised and note down the essentials to stop you throwing in last-minute items.
2. Roll your clothes tightly

Having a suitcase full of creased clothes won’t do your Instagram holiday snaps any favours. Look your freshly-ironed best and save space by tightly rolling your clothes ? not folding them.
3. Pack a canvas bag

These make for excellent spare hand luggage, perfect for carrying shopping, beachwear or even storing dirty laundry.
4. ...