If your cap won’t open easily, it may be clogged with Yoga Grip solution that has dried and created a residue preventing cap from opening easily. This can happen overtime and be reduced in future by closing cap tightly and immediately after each use. This issue may be resolved by unscrewing the cap, turning cap upside down, and running hot water through cap (hot water with pressure works best). Shaking bottle well before use will also help to prevent this issue.