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These were designed for people that camp in their cars. Read the whole story here http://diycarcamping.com/2014/12/05/stop-slips-with-3d-printed-crate-toppers/ They're for sale on that site if you can't print in flexibles.
Rubber Grips For Milk Crates
Order summary

Rubber Grips For Milk Crates
Color:
Quantity:
Subtotal
$
Delivery (May 05 - May 07)
Free
Total
$