We purchased 4 of the bottles for use in WDW in April. Ive given then a rough workout with softball and baseball games and recent trips. I use the bottle to filter the nasty hotel water when traveling and it did well through the airport. I simply go through security with it dry and fill it from a fountain or drink machine when safely on the other side. My 4 year old son uses one when we go in the car and they have not failed or leaked! Ive attached an aluminum clip (similar to a rock climbing clip that is not for climbing) to each bottle with a different color for each person and easy clipping to the stroller or belt loop. It seems like the leaky problems come from not tightening the filter or cap, but could simply be a bad batch of bottles. While ours havent been to WDW yet theyve been to several cities and passed the small child test. The small plastic cap on top will likely be pitched in the first 30 seconds as it has no leash or attachment when not in place.
Mike

DW

DS (4)

DMIL

First visit 1976, last visit WDW 2/2010 BC CL and DL GC 12/2010, future WDW 7/2012 (off site meeting), 4/2013 Poly with cruise!