So not spiral bound but fairly compact [Tarascon](www.amazon.com/Tarascon-Pocket-Pharmacopoeia-Lab-Coat-Edition/dp/1449673619/ref=sr_1_1?ie=UTF8&qid=1381468759&sr=8-1&keywords=tarascon+pharmacopoeia+2013) makes two sizes of pocket drug reference. Might be what you're looking for.