This has concerned me a little too, i dont use the sling too much atm cos i generally just take her from my parents to ours some days so i take the pushcahair (i must get my sling and carrier out more as she loves being in them in the house) and i slipped a few times on the ice outside, i jsut take it very slowely just in case, i nearly slipped down the steps carrying her pushcahir dwon them a few days ago, scared the crap outta me as i know i wouldn't have let go of the buggy id have hurt my back instead