Best (safe) bag for the water parks

[zavandor]

I'll be putting to good use the Platinum pass I'll have for my trip this September, so I'm planning a couple of days at a water park.
I'd like to have a lockable bag that could keep a reasonable amount of stuff (a change of clothes, water shoes, sun screen, water bottle, a snack) and reasonably safe to be left locked on a chair all day. I would not leave any valuables like a phone, I guess the bag would be more valuable than the content
In the past I've rented a locker but it's not convenient to use it during the day to store and retrieve stuff multiple time a day.
I remember I've read here people reccommending PacSafe. I've found this one that looks like a good option:
https://www.amazon.co.uk/Pacsafe-Travelsafe-Anti-Theft-Portable-Black/dp/B01FUA7I8Q
It has the bonus of being usable as a backpack too, so I might use it outside the waterparks as well.
Anyone used it? Or may suggest an alternative?
I am worried it might be too big to bring it as a personal item onboard the flight or too heavy for everyday use.
Thanks

 

[Amw1064]

I have never used but I read a lot of people use the Kyss bags. Every year I think about getting one but so far have not.

 

[Anal Annie]

We just use a combination lock to close our regular pool bag and then a small cable lock to attach the bag to the chair when we're at the water parks...

https://www.target.com/p/master-lock-cable-combination-lock-5/-/A-14440016#lnk=sametab

https://www.target.com/p/master-lock-cable-combo-lock/-/A-14439954#lnk=sametab

 

[thepops]

We have a KYSS bag and it works great. I think we got the medium size and it holds a ton of stuff.

 

[Deb & Bill]

I'll be putting to good use the Platinum pass I'll have for my trip this September, so I'm planning a couple of days at a water park.
I'd like to have a lockable bag that could keep a reasonable amount of stuff (a change of clothes, water shoes, sun screen, water bottle, a snack) and reasonably safe to be left locked on a chair all day. I would not leave any valuables like a phone, I guess the bag would be more valuable than the content
In the past I've rented a locker but it's not convenient to use it during the day to store and retrieve stuff multiple time a day.
I remember I've read here people reccommending PacSafe. I've found this one that looks like a good option:
https://www.amazon.co.uk/Pacsafe-Travelsafe-Anti-Theft-Portable-Black/dp/B01FUA7I8Q
It has the bonus of being usable as a backpack too, so I might use it outside the waterparks as well.
Anyone used it? Or may suggest an alternative?
I am worried it might be too big to bring it as a personal item onboard the flight or too heavy for everyday use.
Thanks

Platinum or Platinum Plus? Platinum Plus includes the water parks and more. Platinum is four main parks 365 days a year. Gold is four main parks and blocks out Easter and Christmas/NY holidays.

 

[zavandor]

Platinum plus. It's the pass offered last year to DVC members.

 

[WDWLODGE]

We have a CoolBag Gen 1 and it works well. We took it on our cruise last year and will take it to the water parks this year, since we also took advantage of the Platinum Plus Offer. My wife says it is a little heavy to carry around. It has handles and also comes with straps to use it as a back pack.