I always bring bags/gloves/grabber with me whenever I visit the local national park. The rubbish is particularly bad in popular picnic spots, like the areas around Audley^1. The NPWS staff do a great job of keeping the parks clean, but they can't get everything. You'd be shocked how quickly you can fill a garbage bag on a short walk. The most common items by far are disposable coffee cups and cigarette packets (with nearly 100% imported packaging). Just make sure you're careful about snakes in summer. I once put my hand within striking distance when picking up a chip packet! Some of them are so well camouflaged.

1: https://www.nationalparks.nsw.gov.au/things-to-do/cafes-and-...

Thanks mate, glad I'm not alone doing this.

When my brother and I were young, my parents used to pay us 5 cents for every piece of rubbish we picked up on bushwalks. We got a few dollars to buy the things they would have invariably bought for us anyway, and the walking tracks became, for at least an hour or so, free from garbage.