Your friends are not correct !
You lend them your equipment and of course, they forget to give it back.
You have it everywhere and you dont remember who has what?
Lender could help you.
Create your own loan forms (and your own borrowing forms because You are not blameless either).
Its easy to do:
-Enter the borrowers information,
-Fill in the fields about the loaned item,
-Set a reminder,
-Enter the location,
-Take a picture... and thats it.
From now on, your friends will have to behave themselves or you will be ruthless, Im sure.