Of course popping corn yourself and giving to the kids in reusable containers saves you money, reduces packaging, and will almost certainly be lower in fat and salt.
These popcorn brands do provide some fibre at around 8-9% and a slightly better choice for kids' lunch boxes than chips.
Just to compare:
- Messy Monkeys popcorn has 9% fibre, 22% fat and 350mg sodium per 100g.
- Grain Waves chips have 6% fibre, 21% fat, and 390mg sodium.
- Smith's crisps have 3% fibre, 34% fat, and 550mg sodium.
Messy Monkeys Lightly Salted Popcorn has the lowest fat and salt that I have looked at.
So next time you are looking for kids' snacks compare the fat and sodium and choose the lowest you can find! If you have the time, popping corn yourself is healthier and will save you money and reduce the need for single-use packaging.