I'm not really looking for an answer, I just want to bring it to the developers' attention:
After taking a good look at https://2e.aonprd.com/Rules.aspx?ID=257 and https://2e.aonprd.com/Rules.aspx?ID=258 which lists conversion rules for items of different sizes I think the RAI meaning is:
"Because the way that a creature treats Bulk and the Bulk of gear sized for it scale the same way, Tiny or Large (or larger) creatures can usually wear and carry about the same amount of appropriately sized gear as a Medium creature."
So if creature size and equipment size is the same, it has the listed bulk for items in the CRB.
Looking at table 6-20 makes me conclude the following. If the creature does not change in size but you change the size of an item that it is holding:
* each time you increase the size of an item by one step, you double the bulk
* each time you decrease the size of an item by one step, you halve the bulk
* doubling L bulk makes it 1 bulk, halving 1 bulk makes it L bulk
* doubling negligible bulk makes it L bulk, halving L bulk makes it negligible bulk
* halving negligible bulk makes it negligible bulk
Looking at table 6-19 in https://2e.aonprd.com/Rules.aspx?ID=257 and reading the text makes me conclude that the rules are talking about normal sized item bulk.
"A Large creature treats 10 items of 1 Bulk as 1 Bulk, a Huge creature treats 10 items of 2 Bulk as 1 Bulk, and so on." seems to confirm the "bulk halving/doubling" rules listed above.
However the following sentence seems to contradict the above statements:
* "A Tiny creature doesn’t treat any items as having negligible Bulk."
seem to be in direct conflict with
"Because the way that a creature treats Bulk and the Bulk of gear sized for it scale the same way, Tiny or Large (or larger) creatures can usually wear and carry about the same amount of appropriately sized gear as a Medium creature."
Meaning that tiny creatures could never carry anything in their size that has negligible bulk.
PS: I know, boring topic but I need to get this in code to automate bulk calculation so I'm hit with the edge cases
PPS: If you agree with my rule interpretation, let me know :)