Stasher silicone bags are a good quality expensive reusable option for food (and not only). The bags are very versatile, the limit being just the size; I use them to store, carry, freeze, refrigerate, warm-up, cook food and anything in between. The silicone is quite thick, but still somewhat flexible; the thick silicone makes them really durable, but I would still advise care to not scratch or puncture the surface with something very sharp. The Stasher bags make a great addition to my plastic free reusable items collection of household items. Overall, I wouldn't consider them that great for voluminous items, since the silicone is quite thick and the opening quite narrow. And if you pack too much stuff in them the pinch-lock can easily open; but if you don't over stuff the bags the seal is air-tight. Still, personally I won't store liquids like soup in them. I personally wash them in the dishwasher and they always come out 100% clean. I just make sure that I `spread` out the opening as much as I can without putting stress on the silicone. I never noticed gunk hiding in the crevices of the pinch-lock or around the corners; and since mine are transparent, they would be easy to spot. If I leave them stretch-opened in the dishwasher, they dry out completely. Depending what I stored in the bags, they do get some staining in time; but I consider this part of the regular wear and tear. Otherwise, my bags were used hundreds of times in the freezer, microwave and oven, without any issues. Snack size: The snack size is pretty small, it's more usable for portioned snacks (puffs, nuts, crackers, dried fruit, homemade granola bars). It's quite sleek, so it fits in bags and backpacks, while keeping items safe. If you sit on the bag you'll crush the puffs/crackers, but otherwise they do help with keeping snacks from crumbling. I used sometimes to freeze smaller portions of fruits or half of an avocado. It's the perfect size to bring vitamins and supplements to a week long vacation/travel. Sandwich size: The sandwich size is the most versatile for me. I use it to store small portions of meats and veggies/fruits in the freezer. I use it for leftovers in the fridge. I use it to carry snacks, from rice cakes, to carrots, sugar snap peas, crackers, puffs. I use it for bread and sandwiches; the bag fits regular sized sandwich bread, but it's too large for thin sliced small portioned ones and not big enough for super-sized slices; if you make huge over-stuffed sandwiches, they won't fit in the bag. Besides storing bread, the bag is great for reheating stale or frozen bread in the oven. I pre-heat the oven to 375 degrees, put the bread/buns locked in the bag for 7-8 minutes and get back crusty warm delicious bread. I bet it works for (non-glazed) donuts and pastries as well. I also cooked eggs in the sandwich size bags, both in the microwave and in boiled water. The eggs are really fluffy when cooked in the Stasher bags. Big size (1/2 gallon): I mostly use the big size to freeze large quantities and sizes of veggies (great for long one like green beans and asparagus). But the best use for the 1/2 gallon bag for me is making popcorn. I just put in the salt and the popcorn kernels, run my microwave popcorn program for 3-4 minutes, and get perfectly popped popcorn each time; you can add oil or butter if you like, but it's not mandatory. I would repurchase this bag again and again just to use it for popcorn. Mine started getting brown stains from all the times I made popcorn in it. Another great use for the big size is steaming veggies in the microwave for a quick meal. It works for green beans and smaller broccoli and cauliflower florets. Stand-Up: This is definitely the most versatile bag, from pantry to freezer, from produce to soups. It can hold a large diversity of dry bulk goods, rice, beans, smaller pasta, crackers, nuts, cereal. Fruits and smaller (or cut) veggies fit perfectly both for fridge and freezer storage. They are great for meal prep, both for storing food and for taking it along (although the opening won't allow too much flexibility from eating straight from the bag). In the big one I can store even whole cut watermelons and halves of spaghetti squash. I have purchased various sizes from Amazon both individual bags and sets, usually when there's a deal around. I have reviews for different sizes with the same overall comments, but specific considerations depending on the size.