I keep getting these silicone bags as gifts from a family member who works at a store that sells them, and I have to say I'm really not a fan. The silicone material is very thick, bulky, and heavy. As a result, the amount of usable storage volume inside each bag is infuriatingly small compared to the total space that each bag takes up. The seals are difficult to close and even more difficult to open. Worst of all, the bags are near impossible to clean, particularly the inside seams. I once used one to cook some chicken in the oven and the inside was permanently stained. I put it in the dishwasher upside down with the seal spread open over the tines, but the hot soapy water still couldn't reach the inside corners of the bag. I had to scrub out the inside seam with a toothbrush. Way more effort than it's worth.

In my opinion, you're better off with mason jars.