Magic weapons and armor are one of the bases of the game. While there are many wonderful properties that are already available, sometimes there is a particular spell effect that you simply must have.
For example I will be playing a gestalt game soon where I am building a druid zen archer monk where I plan on using wild shape and a bow. The item [polymorphic pouch](http://www.d20pfsrd.com/magic-items/wondrous-items/wondrous-items/m-p/polymorphic-pouch/) has a much-desired feature, it doesn't meld when you polymorph.

As a bonus under the [polymorph](http://www.d20pfsrd.com/magic#TOC-Transmutation) rules

> 
> If your new form does not cause your equipment to meld into your form, the equipment resizes to match your new size.
> 
> 
> 

Originally I was going to add the effect to the weapon as if I was making a wondrous item as per the [standard table](http://www.d20pfsrd.com/magic-items#Table-Estimating-Magic-Item-Gold-Piece-Values). While talking with a friend about it they instead priced it as another weapon property such as keen, flaming, shocking burst and thus expressed it as a +x bonus. I have to admit that this approach had not occurred to me, and thinking on it makes far more sense than the method I had planned on using.

Now there is an armor property called [wild](http://www.d20pfsrd.com/magic-items/magic-armor/magic-armor-and-shield-special-abilities/wild/) that serves a similar effect in that it lets you benefit from something that's melded with you. Using the weapon would be different, but similar.

Which approach to pricing spells onto magic weapons and armor gives more consistency with the game's overall pricing?