P.E.A.C.H. - Animated Caltrops

[harmor]

Animated Caltrops

Aura faint transmutation; CL 2nd

Slot -; Price 900 gp; Weight 2 lbs.

Description

This apparently normal bag of caltrops (http://www.d20pfsrd.com/equipment---final/goods-and-services) allows the user to move the
caltrops by utilizing the spell mage hand (http://www.d20pfsrd.com/magic/all-spells---final/mage-hand-1).

Construction

Requirements Craft Wondrous Item (http://www.d20pfsrd.com/feats/craft-wondrous-item-item-creation---final), mage hand (http://www.d20pfsrd.com/magic/all-spells---final/mage-hand-1); Cost 450 gp

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I based it on Hand of the Mage (http://www.d20pfsrd.com/equipment---final/magic-items---final/wondrous-items-2#TOC-Hand-of-the-Mage), but since you can only move the
caltrops I halved the price, but then doubled the price because it
doesn't have a Slot - thus same price as Hand of the Mage. What do you guys think?

[CEBedford]

Are the caltrops normal and the bag is the magic item? If so that's nifty and means the player can replace the caltrops should things go sour and they get left behind.

[Aleucard]

Alright. How long do the caltrops retain the ability to be moved at your discretion? Also, can you forego some/all of the movement to cause the caltrops to get an attack bonus to hit (seeing as they'd be directed so to get underfoot, or even attack directly)? This seems like one of those items that would be VERY useful for a mundane equipment lover like me.