Instruction: Generate an answer to the question by utilizing the information contained in the document.

Input:
Question: Can a 3-yr-old open these containers by himself?
Document: We love the stainless steel containers. They are the perfect size for a pasta or rice dish. At least they are four our 3 year old who tends to eat small amounts at lunch. The lids are easy for her to get on and off by herself. And they are leak proof. However, they do begin to crack after some use. Thankfully, replacement lids can be ordered for $3.50 (for 2 lids) + $1.95 shipping on the kids konserve website.
I use this for my 5-year old's kindergarten lunch. Usually, we put yogurt, applesauce in it, but sometimes I'll use it for cookies, just to avoid using a plastic bag. He finds these containers easy to open. They seem durable -- we've only had them for about 3 weeks -- so I suspect we'll have them for a long time!
These are the first containers that I reach for when packing my son's lunches. They have held up well (after about a year) and are the perfect size.My son is only 17 months old, so he doesn't open them himself. I can't speak to the difficulty of opening/closing the lids for children.
We bought these to help make my son's lunches more 'eco-friendly'. These containers are great for fruit or snacks and have held up well over the past year. I generally wash them in the dishwasher (top rack) with no issues. They close tightly (no leaks) and my 4 year old can open them without help. I highly recommend these to cut down on plastic bags!
These containers are really great and hold up very well. My kids 6 and 2 yrs uses these everyday to take along fruit and snacks for school. I have filled them with yogurt and also cut up oranges with no leakage. The lids stay on very tight so much so that my 2 year old has to have her teacher open the container for her. I think that is a good thing as that shows there will be no leakage.
Our whole family uses these containers everyday, and they work great. I have them in 3 sizes, and this is the one I grab for the most. Great for oatmeal, snacks, fruits, etc!
I ordered this to pack snack for my 7 year old for school. This is the perfect size for crackers or fruits etc. I was a little concerned since some of the reviews mentioned the lid was hard to open. The lid is easy to open and close for us.
The lid is very snug and therefore my four-year old cannot open it by himself, but better to be snug than to have everything fall out.The adhesive on the sticker that is on the bottom of the container is ridiculously strong. I have been using and washing this item for over a month and still cannot get the glue off the bottom.
), they come in twos, they don't leak, they are easy to clean, my 5-year-old child seems to be able to open them just fine at school, but if your young child does not close the lid correctly, you may want to put this container in a small ziploc bag to avoid messes (finding blueberry juice or yogurt all over their lunch box is not a good thing at the end of your day!). I never put them in the dishwasher.
My five year old has only this year been able to do so. I assume this is what makes them leakproof, so I would trade it. But some preschools encourage independence, and these containers do not really foster that.
Answer: My four year old could open them with some effort and practice. But I'm not sure about three.  The upside is that she's now six and the lids are easier to manage and still watertight after two years of nearly daily use and even some trips through the dishwasher.