Since Bugles contain no animal based ingredients that makes Bugles Vegan.
If you're a Vegan and don't eat animals and meat products you can eat Bugles because they are vegan and are made with no animal ingredients.
When something is not vegan it will contain animal ingredients but when the food contains no animal ingredients, meat etc then the food is vegan.
Any snack that contains no animal ingredients are vegan as most snacks are.
Although pork skins chips snacks are not vegan because they are made with pig skin and are meat.
So if you're vegan you will want to avoid eating any pork rinds or pork skin chips.
But most other snacks and chips are indeed vegan.
Bugles are a very delicious snack but not all that great for you so you don't want to eat too much of the bugles.
But when eaten in moderation the Bugles are okay for you.