Unfortunately, kickstarter limits you to just one reward per pledge. BUT we have a solution!!
If you have a particular combination of rewards that you would like to select (print comics plus T-shirt? limited edition 4-pack plus poster? something else?), simply post a comment with the suggested combo reward you would like, and we will add some new ones.
Also, if you have already selected a reward and would like to upgrade to a new combo reward, you can modify your selection via kickstarter, they will allow you to revise to a larger pledge.