i would say 25, the 30 just looks too big. and for a bag you carry in the crook of your arm, i dont think you would want the bigger size. but its all up to you. i think the smaller one looks cuter. the epi does seem a bit bigger to me, ah! i cant even make decisions myself! lol. can you fill up your epi speedy 25, if you can then get the 30 if not id say 25 all the way! good luck