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As a house rule, a bag of holding weighs 1/2 pound, regardless of type or contents and appears, from the outside, to be about half full of something light-weight such as dried leaves.
If the bag is overloaded, or if sharp objects pierce it (from inside or outside), the bag ruptures and is ruined. All contents are lost forever. If a bag of holding is turned inside out, its contents spill out, unharmed, but the bag must be put right before it can be used again. If living creatures are placed within the bag, they can survive for up to 10 minutes, after which time they suffocate. Retrieving a specific item from a bag of holding is a move-equivalent action, unless the bag contains more than an ordinary backpack would hold, in which case retrieving a specific item is a full-round action.
|Bag Type||Longest Rod||Water||Weight Limit||Volume||Coins||Market Price|
|Type I||5 ft||30 gallons||250 lb.||30 cu. ft.||12,500||2,500 gp|
|Tye II||8 ft.||60 gallons||500 lb.||70 cu. ft.||25,000||5,000 gp|
|Type III||10 ft.||120 gallons||1,000 lb.||150 cu. ft.||50,000||7,400 gp|
|Type IV||12 ft.||180 gallons||1,500 lb.||250 cu. ft.||75,000||10,000 gp|
It has two side pouches, each of which appears large enough to hold about a quart of material. In fact, each is like a bag of holding and can actually hold material of as much as 2 cubic feet in volume or 20 pounds in weight. The large central portion of the pack can contain up to 8 cubic feet or 80 pounds of material.
|Location||Longest Rod||Water Capacity||Weight Limit||Volume||Coins|
|Side Pouch||1.5 ft.||2 gallons||20 lb.||2 cu. ft.||1,000|
|Central portion||3 ft.||9 gallons||80 lb.||8 cu.ft.||4,000|
From the portable hole description on page 264 of the Dungeon Master’s Guide:
When opened fully, a portable hole is 6 feet in diameter, but it can be folded up to be as small as a pocket handkerchief. When spread upon any surface, it causes an extradimensional space 10 feet deep to come into being. This hole can be picked up from inside or out by simply taking hold of the edges of the cloth and folding it up. Either way, the entrance disappears, but anything inside the hole remains.
The only air in the hole is that which enters when the hole is opened. It contains enough air to supply one Medium creature or two Small creatures for 10 minutes. (See Suffocation, page 304.)
As described in the excerpt, the space inside a portable hole is a cylinder 6 feet wide and 10 feet deep, which contains about 280 cubic feet of space. That’s enough to hold about 100,000 standard coins or 2,100 gallons of water.
I would house rule that placing any item that contained a non-dimensional or extra-dimensional space into another one have a 60% chance to spill out into the astral plane. An exception to this would be rope trick, or any other magical space created for the purpose of providing refuge or shelter to PCs.