yeah,I'll pick the right tentMany rectangle bags have a sleeve for the pad to fit into so they stay together. Big Agnus makes a mummy combo the same way. I've also heard of people who stick velcro ties on both units so they can be tied together. It sure is a nuisance when it happens, isn't it?
thank you very muchApply a dozen or more small dots of clear silicon to your mattress, this will stop the sliding (you can always add a few more if needed, but unlikely). An old trick I've used this for years, works great.