Bushwalk Australia

I have already a dry bag but I need a zip lock style of bag to keep car keys, phone and wallet dry with the assurance the thing won't leak. Recently I met someone in a hike that had one of those bags which looked great, a bit like a toiletry bag feel but clearly made for people into canyoning/kayaking. It was very solid, with a tough zip system and highly foldable. I made the mistake of not asking where they purchased the bag from; now I'm having trouble finding one like that (or a similar one).

Any personal recommendations?

Ortlieb have or had a small roll-top bag that might be what you are after.
Possibly something like this?
https://www.ortlieb.com/us/safe-it
https://www.ortlieb.com/us/dry-bag-ps10

Maybe try Exped? - they have zip bags that loo like toiletry bags although they are not waterproof (they are weatherproof). I have one of their zip seal bags which have a combination of a zip and beefy ziploc style closure instead of a roll top. They are built for phones and tablets though and are probably not suited for phone, keys and wallet though.

I also have an old style AquaPac (before they redesigned the strap attachments which were a step backwards) - it is great for throwing a (small) camera, phone, keys and whatever else small you have. Rather than a zip lock, the closure is a clamp style that prevents you from closing it incorrectly and is very watertight. It is not something I take hiking though although I use it for canyoning or kayaking etc.

Another option is something from Overboard.com.au - they have a fairly wide range of waterproof items including fanny/belt packs which may do what you want.

S2S ones are pretty trustworthy. I've never had a leak.