We all likely agree on the ridiculousness of this 1 quart bag n 3oz container / 1 litre bag l 100ml container rules. As long as you have one bag and it's not bulging then you should be fine. Some of the stuff I've put in the bag has been in 4oz and 6oz containers. Shocking, I know. One bag with two 4oz containers - I should be imprisoned. I've not once had any US or EU security check stop me about my bag o' liquids in about 20 flights since the rule went into effect. I've even taken a half dozen red glowsticks to Honolulu for the U2 concert last December. So I doubt there's any issue with using your own small containers.
Carol, I agree that the whole thing is frustrating and a bit silly. But actually the reason why the 3oz rule is in effect is not because the liquids by themselves are dangerous but because they have figured that you need more than 3oz particular liquids that - when MIXED - would be dangerous. Of course, you could carry on an empty water bottle and as many full 3oz containers fit in a quart baggie (lots) to give what I imagine is enough to cause a problem...but hopefully no one dangerous dares to try that!!!!!
