While you can save half an avocado in the peel by spreading a little oil on the green flesh, what about leftover mashed avocado? This genius hack from nomnomkids isn't just for kids. Take a reusable food pouch, fill it with mashed avocado, squeeze out all the air, and store it in the fridge.
You can buy the Nom-Nom Kids pouches if you live in the UK, or order these WeeSprout Pouches from Amazon (six for $17). They're washable and easy to pack in lunch boxes — way more convenient than bringing a whole avocado that'll end up getting knocked around and bruised.