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Message: <blockquote data-quote="Kobold Stew" data-source="post: 6215703" data-attributes="member: 23484">Cool question.Given magic, I'd suggest the following.* The bag is watertight, and will only let water in if opened. It's accessing an inter dimensional space, and so there are no pressures, no gravity. Normally, you in and find the item you want, your hand doesn't actually search 30 cubic meters of space.* If opened underwater incorrectly, it can overload and drown everything. It can't be foolproof (or, properly, villain proof).* But it can also be opened correctly underwater. What's correctly? Upside down, of course. You tip the back so the opening is in the bottom and untie it. The 30 cubic feet of air stay in, because air won't push down underwater. Stuff won't fall out (there's no gravity in an inter dimensional space, since you can reach for the item you want easily under normal conditions).So -- open it upside down, reach for your object, and close it up.  It also means that the bag can be used as a diving bell of sorts, with 30 cubic feet of breathable air (though without visibility). Someone brave without swimming ability could even jump in and be carried for a short while, but would be unable to open the bag from the inside. So you need to trust your friends. I'd prefer just to use it as a diving helmet, and be pulled by someone who could see where I was going.<img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f600.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":D" title="Big grin    :D"  data-smilie="8"data-shortname=":D" /></blockquote>

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