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Message: <blockquote data-quote="Greenfield" data-source="post: 6217755" data-attributes="member: 6669384">How big/what shape is the inside?  I'd always taken that as variable.  Think of the inside as made of Spandex or some similar material.  It probably starts about the same size as the outside, but can stretch as needed.  That's why you can fit your 10 foot pole in there, even if it's the small bag that's under a cubic meter.  The dimensions can change as the situation demands, but the total volume still has a maximum limit.What makes me think that?  Because if it's holding an amount similar to a backpack, everything's within reach and can be withdrawn as a move action.  You only go to full-round action when you exceet that standard, and the bottom might stretch out of casual reach.  If the inside were always at maximum extent then that rule about move action v full round action wouldn't be there.Will normal backpacks and sacks fill and rupture if immersed?Backpacks and sacks (mundane, not magical) will certainly fill with water if immersed, though it may take time.  Unlike magical bags, they aren't air tight when closed (See rules on suffocation inside)But mundane backpacks and sacks don't have rules that specifically say they tear or rupture if they have too much in them.  Magical bags do.A normal bag may burst if you try to lift it when it's overloaded.  Ask anyone who has ever bought groceries.Magical bags, on the other hand, don't get heavier when loaded, the weight is never any kind of strain on the straps, cords or handles, so lifting it wouldn't be the issue.Is the air space inside the same for all the bags?  Seems wrong, since some have a bigger capacity than others.  But if the interior space stretches as needed then it would make sense that the air space in any given bag at any given moment would be the same, since the total volume of any given bag changes to meet demand.  That accounts for a standard 10 minutes of air for all the bags, since the internal space will always be "occupant plus gear plus X", where X is 10 minutes of air.So, while I see nothing to suggest that gravity is somehow absent inside the bags, I do think that the rules suggest that the space inside is variable.  It lets a lot of other rules fit.Plus, historically, the source for the item was a "wallet" given to Perseus in Greek mythology, one that would "Expand to fit whatever you place inside it."  He used it to carry the head of Medusa.</blockquote>

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