The refill section is very low profile. The only comparable product right now is the Speedfil A2. The A2 has a bulkier refill section, but its benefit is absolute bomb-proof watertightness. The A2 will never leak. I'm looking forward to testing the Profile HC Bottle to see how it compares.
Our second day on the Interbike showroom floor was another great harvest of gear photos and new info. Today we looked at a variety of things, from Campagnolo EPS all the way down to a simple BTA bottle from Profile Design. There's plenty of great stuff in the gallery - have a look, and check back in tomorrow for our final gallery.