Seal is VERY TIGHT and requires aligning the lid. Recommended for older kids + adults. Toddlers or young children would need assistance..NO MORE STRESSING ABOUT WHAT TO COOK FOR DINNER or WHAT TO EAT WHEN YOU RE STARVING POST-WORKOUT. Just prepare food ahead of time or store leftovers in our containers, then pop them in the oven or microwave to enjoy a home-cooked meal anywhere at home, work, school, or the gym. Fast & easy!.Friends, family, colleagues will be longing for your lunch box from the first moment they see it. Fresh, functional and modern design.USE AND CLEAN WITH EASE: Bento boxes are durable, microwave, dishwasher and freezer safe..Professional customer service for you, please feel free to contact us if you have any questions.