Blossom Mason and Canning Jar Sipping and Drinking Lid Caps, Silicone, For Wide Mouth Size Mason Jars, 4-Inches; Blue; Set of 4

Love these mason jar caps. I don't use them as drink caps, though, I use them to cap my viili, kefir, and sourdough cultures. I also plan on using these on any future thermophilic cultures, like yogurt. Before getting these, I was using coffee filters with rubber bands and they would always invariably stick to part of the jars and rip or get dusty, and my cultures never seemed to be all that happy and would dry out on the surface. These, however, are a fantastic alternative, as they are imminently reusable, not very fussy to take on and off, silicone (not plastic), dishwashable and self-venting. My kefir grains, especially, seem to love these caps in that they are now multiplying like crazy and yielding a creamier beverage.Having used these these now for short cultures and inspected them up close, I probably would not use them for long term anaerobic fermentation. There is an x-shaped flap over where you are supposed to insert the straw, which would allow oxygen to be sucked into the jar if there was negative pressure. While the flaps might hold an airlock securely, I'm not sure how airtight this would be over weeks or months. For a day or maybe up to a week long fermentation where I would be relying on there mostly being positive internal pressure inside the jar, with an airlock, I could see myself using these if I were out of other fermentation vessels.

I really like these silicone covers. They work wonderfully for our cold brew coffees in our 24 oz mason jars. I don't travel with it, so I can't speak about spilling in a bag, but I know that if I knock them over on my table, I get no leaking (assuming I promptly pick it up - I didn't try leaving it on its side - I want every drop of my precious cold brew!).You do want to make sure you have the lid firmly pressed down 100% of the way around. I have horribly arthritic hands and am able to manage this, so I would think it would be easy-peasy for younger hands. Look at it and make sure you see the bottom of the jar pressed up against the lid, and you're set to go!They wash up easily in the dishwasher. Since blue is not my favorite color (especially in association with food!), I would wish for another color. Also, don't really see a need for the ripples on the bottom of the lid - I like clean lines. But otherwise, there's nothing I don't like about them. While I haven't tried it myself, I think they would be just as useful with a hot beverage (in case you like to drink your hot coffee/tea with a straw!).

Love these! The only thing for me is the skirt that goes out around the bottom of the lid is really kinda pointless. I get that it's suppose to look cute but it seems like a waste of material. But anyway, I do love them. I wanted to stop using plastic cups for my toddlers so I figured glass mason jars with silicone lids, silicone sleeves, and silicone straws! And I love it! I have these soft silicone straws that I worried wouldn't work because the lids have a tight hole for a straw but they worked and it's almost drip proof. I mean look, I have had a million sippy cups and they all leak at least a little so these are just as good and no chemicals! I took pictures of the straw hole not leaking, after a while I did get one half of a drop, except from the straw of course cause there's no valve on that. But I also shook the cup in an upright position and no milk dripped out the sides at all and didn't even come close to dripping, in the picture you can see the milk bubbles but the tight ring stopped any leaks. So anyway, I love it!

There were supposed to be 4 per package. I ordered 3 packages and 1 only had 3 in it.

I like them, both in idea and appearance. But they will not be suitable in canning because there is a cut in the middle for a straw, which I didn't realize. I thought the drinking lids are a different product. They will, therefore, not vacuum-seal a jar. They may be suitable as storage lids. The cut in the center is tiny and liquids actually do not spill through it, but I would not feel comfortable storing highly perishable foods in a jar with a lid that is not 100% sealed. Maybe ok for stable foods, such as jam. I found the lids to be a bit stiff and hard to stretch, but once in place, they sit firm and sturdy.I also purchased the larger size lids, for the wide mouth jars, which have no cut in the middle.

LOVE these silicone lids!! I use them for my toddler in her plastic Ikea cups and stainless steel straws ("Short Safer Rounded End Stainless Steel Straws for Kids" from Mason Jar Lifestyle). That combo fits perfectly! I am planning on getting Stainless steal kid cups from Caveman Cups to use with these lids in the future, too. These lids are so great, not a single drop of liquid comes out when she knocked over the cup a couple of times. Liquid will come out of the straw, but we were lucky each time, I guess.While I was opening the packaging, something had pricked my finger. It was a small shard of metal that pierced through the edge of one lid. It didn't not puncture an area that would affect the seal, thankfully. Very sharp piece of metal, though. Everything was fine after I discarded that shard. I'm sure it was a one time thing, but just in case, I'd suggest to check each lid. I still highly recommend these lids, they are amazing!

I almost always use either a quart or pint and 1/2 mason jars for drinking cups.I have several different types of lids for this purpose and these are my favorites. Easy on and off and I do not have to worry about anything crawling inside my cup even when I am out in the garden.