This mum's brilliant $3 Kmart travel hack has gone viral - and it's easy to see why!

There's nothing more frustrating than packing toiletries when travelling.

Not only do they take up a lot of valuable space in your bag, but there's also the stress of size restrictions on liquids now.

Of course there are miniature travel products you can buy - but they're not exactly cheap with often one 100ml bottle costing around $4.

But this mum's genius Kmart travel hack is here to save you time, money, and sanity!

All you have to do is pick up a couple of $3 travel pack bottles from the make-up section of Kmart and fill them up.

Photo / Facebook

Sharing the tip on Facebook, Nat Stein said: "Kmart sell these travel bottles in a 2 pack for $3. Filled them with shampoo, conditioner and shower gel and attached to a lanyard. Perfect for my girls when we go camping to take to the showers. Also would be good for swimming lessons. I have ordered some stickers."

It's no surprise the hack has gone viral with parents commenting on how brilliant the bottles are for travelling or school activities with kids.