A serious Perito Moreno toilet question!

Now bare with me here - but is it in any way possible to have a sneaky toilet stop on the Big Ice Perito Moreno glacier walk??

I am very keen on doing the extended trip (as opposed to mini ice) but do have worries about not being able to relieve myself for 4 hours!

Any feedback would be most welcome!

Now bare with me here.

Best unintentional pun of the week.

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