Thank you for your review! Great to hear the bottles arrived in excellent condition.

These bottles are designed for STEM classroom activities and are intentionally sold without caps. They're used with activity-specific apparatuses, and in most applications a traditional cap isn't needed. Caps are sold separately for activities that do require them.

If you need caps for a specific activity, feel free to reach out to our team and we can point you in the right direction. We also appreciate the feedback — we're looking at ways to make this clearer on the product page for future customers.