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Worldbuilding

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    $\begingroup$ You mean something like a syringe (just move the piston to adjust capacity) or like a wineskin / waterskin? $\endgroup$
    – AlexP
    Commented Aug 29, 2023 at 14:50
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    $\begingroup$ Why should the metal be rigid? Thin sheets of metal are not rigid at all. Consider for example the metal wrappers for chocolate... $\endgroup$
    – AlexP
    Commented Aug 29, 2023 at 15:14
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    $\begingroup$ @CyrusDrake Does the liquid need to be touching on all sides the metal? Or can there be some vacuum space around it? $\endgroup$
    – Tortliena - inactive
    Commented Aug 29, 2023 at 16:46
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    $\begingroup$ @Tortliena Let's assume for now that vacuum space is okay. I'm very curious to read whatever answer you have in mind. $\endgroup$
    – Cyrus Drake
    Commented Aug 29, 2023 at 16:58
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    $\begingroup$ For rigid metal only, imagine a box (or any other shape with a consistent length and width) open at the top. Add a lid that's not attached to the box but which fits snugly in the opening at the top and can slide down until it rests (or "floats") on top of the liquid inside. Awkward to travel with (but not impossible, with some simple accessories to lock/clamp the lid in place), and may require some design elements to allow air to be expelled when settling the lid. But seems to fit the requirements. $\endgroup$
    – aroth
    Commented Aug 30, 2023 at 2:39