Definitely as
@coby says, eggs are the number 1 best low carb snack. The only packaged thing that comes to mind immediately is pork scratchings (assuming you eat meat) but watch out for additives
Not sure if you're a waffle maker owner, or if you can make ahead of time but a beaten egg with a handful of mozzarella or cheddar makes 2 gorgeous croffles (just the two ingredients), I really don't feel one bit deprived with those.
Shredded chicken with diced pepper, cucumber etc. - I make a dressing with lemon/lime and apple cider vinegar and - I use MCT oil at the moment but extra virgin olive oil or melted butter works well.
An avocado with chopped tomato and full fat soft cheese
Roasted veg eg courgette, aubergine with soft cheese or dressing as above
If you eat meat, any mince fried up as a savoury mince on roasted vegetables as well
You might get some good ideas on the recipe threads or Low carb forum here, some of us post what we've eaten and I get some great ideas there.
Beware of hidden carbs in packaged foods, and if you can it's also probably best to avoid the snacks and treats claiming to be low carb or sugar free, as they can trigger eating too much of them. Speaking for myself there, some people use them happily!