Do you have experience sharing Kiwi Crate or Little Passports between siblings? I see that Little Passports has a 10% sibling discount but that's still steep and I don't want two sets of everything around my house. How problematic is sharing?

My kids are going into 2nd grade and Kindergarten. I ordered two different Kiwi Crates summer camp in a box but I'm hoping they can double up on both.