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The USO is inside security so you will not be able to bring your bags in with you while you wait to check them in. What airline are you taking from ANC to IAH? Since you mention SLC I'm assuming Delta. You will most likely be able to get them to check your bags all the way through to Bonaire. Have a copy of your eTicket with the PNR (6-letter/digit reservation number) and the eTicket number with you at the check-in counter in ANC and they should be able to do it if you ask nicely, especially since DL and CO are partners in SkyTeam, at least for now.