If you are not logged into your account on the site, any item you add to your shopping bag will not remain in your bag if you move from one device to another. Please note they are also not secured until payment has been made.
If you are interested in an item, we recommend logging into your account and popping the items into your 'wishlist', as they stay there for future reference and you can easily move them into your bag when you're ready to make a purchase.