my very first clutch of eggs I used a 6 qt sterilite tub, perlite which was so wet I had to use 2 light diffusers as one would sink into it. I didn't put any holes in my container or lid. before I got half way thru the 60 days for incubating my eggs. my eggs were really collapsing. towards the end of the 60 day, the top of the egg was touching the bottom. I did lose a few but some did survived. my next clutch after I talked to a few local breeders, recommend glad press n seal. I never had a problem since. and it's been over 7 years. I use to use perlite, now I zip tie two 3/4 inch pvc pipes to the diffuser and add water, no perlite. yes it will help reduce the chance of a splash. I carry my egg box a good 20 feet to where I check on them. I don't walk slow with them. I never splash yet, and if I did splash them. they would be OK. it's being constantly wet that hurts them. I can open my egg boxes every day if I wanted to and it doesn't hurt my humidity with them. in the vpi book, it said to check on your eggs every so often. how are you going to learn anything or correct something if you don't know it's happening. if you get too much condensation on the top and it drips on the eggs. tilt the box a little so it runs down the side instead. condensation is a problem cause by difference in temps. temps from the outside of the egg box to the inside of the egg box. my eggs get fresh air once a week when I check my eggs and the last 2 weeks I peel back a corner of the press n seal to make a very small opening for air when the eggs require it the most. what others posted isn't wrong. it works for them. we all live in different places with different conditions. you need to figure out whats best for you.