If you take "As many as I can carry" from a bsb / fsb / crate and have a full inventory ( 100 items or maximum weight capacity ), you get the following messages:
"[19:21:23] You selected max."
"[19:21:23] You can not even carry one of those."
If you choose how many items to take and are at maximum weight capacity, you get the message:
"[19:31:24] You selected 1."
"[19:31:24] You may not carry that weight."
If you choose how many items you want to take from the bsb / fsb / crate and have a full inventory ( 100 items ), you simply get the message:
"[19:26:25] You selected 1."
It doesn't say that your inventory is full or that you didn't actually get the items. I'm not sure if it's an oversight, a bug or intended... but it could definitely be more user friendly