There isn't a whole lot of consistency in Australia around what single-use plastics are being phased out and when. See what's happening in your state.
My Frank doesn't leak if I treat it nicely, keep it upright etc.
But I found an old Tupperware cup that functions more like a thermos with screw down lid. I can chuck that thing in my backpack and trust it to remain hot and not leak for hours. So maybe narrow your search to small thermos's.
My gf got me a custom-printed Frank cup and it's super pretty but it's leaked since day 1 and the lid is a nightmare to take apart and clean properly. They do appear to be selling non-seal sippy lids now though so I might just order one of those to get some use out of it.
We use small thermoses for long walks or hiking with home brews but we're also looking for something we can hand to a barista for single serves. I must be a klutz because with the Frank there is usually a mess. I'll keep an eye out for something with a screw down lid. Thanks.
Contigos are the best. Kinda pricey, but they keep stuff hot/cold for a long time and can take quite a bit of abuse before they die. I have 3 now. The oldest is 5 years old; newest is 2. They’re all a little scratched up, but they’re going strong!
The KeepCup Helix Thermals, the steel ones with the twist on lid, have an anti spill platform underneath the drinking hole and seem pretty good unless you truly upend the cup. Downside is they’re a bit more fiddly to clean, the drinking hole cover is significantly stiffer, and I’m told by the frothy coffee people at work that they’re a lid off job for a cappuccino not to end up all wrong texture wise when drinking it.
Some of the new ones I've seen are lined with a film made from sugarcane. They have the advantage of being completely organic in nature - you can throw them in FoGo. Unlike the plastic lined cups, I think they may have some sort of limited lifespan before they start to dissolve.
I always take my own cup, so I haven't looked deeply into how long they last.