Old-school dungeoneering can certainly strain the carrying capacity of the modern adventuring party. And when ghouls scare off the torch bearers and eat the porters, how are hard-working PCs supposed to get the loot back to town so it can be spent on carousing?
Spell Level: M1
Duration: 1 hour + 1 hour/level
This spell turns a normal small sack into a bag of holding for the duration of the spell. The maximum volume held is 10’x5’x3′, and up to 1,000 pounds may be contained while the bag weighs a maximum of 50 pounds. If the bag holds more than it’s normal capacity when the spell expires, it bursts and the contents are hurled out forcefully.
UPDATE: The initial write-up stated that items in the bag at the end of the spell were lost forever. I altered it to shower them all over the place instead.