There's nothing worse than getting your sandwich out of your lunch box, only to find it's all fallen apart.
The same goes for biting into it and having the filling all topple out the sides.
But a former MasterChef winner claims to have come up with a simple way to prevent this from happening.
Adam Liaw, from Sydney, has shared his top tip for getting your sandwich ingredients to all stick together and it all comes down to preparation.
The trick is to quite literally put some weight on top of your sandwich before packing it up and putting it in the lunch box.
Speaking to GoodFood.com.au the 42-year-old explained his method for making his son's sandwiches.
He told the publication: "My son’s school sandwiches all sit on a cutting board with a heavy plate on top for about 10 minutes before they go into the lunch box.
"This slightly compresses the bread and holds it together with the filling."
And this trick doesn't just apply to regular sandwiches, you can also use it for your toasties.
The expert added that you can use a purpose-built sandwich press to do the job, but he prefers to toast his sandwiches in a frying pan with a little butter, pressing them down with either a heavy saucepan or fish weight on top.
This isn't the only lunch tip he's shared, he previously revealed how he makes the 'perfect' sausage sandwich - though it proved rather 'controversial'.
In a post on social media he revealed he gets staff at his local bakery to slice his loaf of bread lengthways instead of sideways.
According to Liaw, this cut means sausages will fit perfectly in the middle of the bread, so you can fold it round the sausage, a bit like a hot dog bun.
He said: "My favourite (if controversial) summer barbecue hack is to buy a half loaf of bread and get them to run it through the slice length ways instead of sideways.
"It produces a sausage-sized piece of bread that makes for perfect sausages in bread. You're welcome."