Danneris wrote:Do you think this would make it worth saving my bags to open after the patch?
When 5.1 hit, I opened ~80 bags that I had saved up prior to the patch. I got 6 battlestones from them. The Pandaren pet supply bags are a different item and it's possible they're coded to generate contents differently. But saving a few is a small risk. Just resist the urge to open them and see what's inside. I don't know whether the contents are generated upon opening, or whether the actual bag may change on patchday (ie your 5.2 pet supply bags may be replaced by 5.3 pet supply bags, even though the UI displays them as being identical).
*edit* adding a link to some evidence on wowhead
(post 40, it's 2nd if you sort by relevance).