Adding shelving to a chest freezer...

I know this has probably been touched upon before, but wanted to make it easier to get some fresh opinions/ideas on it. I have a fairly large chest freezer but the bottom space has recently maxed out. I'm trying to figure out the best ideas for adding another shelving area to it (without stacking milk cartons). Any good easy ideas/items to use to do this from personal experiences with this?

Thanks!