Dispensing items free for restricted purposes
<p>Suppose a grocery chain charges £0.3 for carrier bags but gives out smaller and slightly flimsier ones for free, but they are imagined as only to be used for fresh produce to be weighed.</p>
<p>Bob sees them and decides he would prefer to use one of these for his packaged grocery purchases rather than pay £0.3 for a sturdier type of bag.</p>
<p>An employee sees Bob putting his shopping into a produce bag and tells him off that they are only for fruits and vegetables. Is it possible to give out something for free but require that it not be used for certain purposes?</p>

<p>These flimsy bags are not given out for free. They're included at no additional charge with qualified purchases (specifically fresh produce to be weighed).</p>
<p>It's like a &quot;buy two X, get a third one free&quot;. You can't just take one X and claim it's still free. Bob needs to first buy something in order to get something for free.</p>
<p>If you buy two kiwis, get a bag for them, and proceed to eat the kiwis, you'll own an empty bag. It doesn't matter exactly when you eat these kiwis, this could even be directly after paying for them. And what you do with your bag is up to you.</p>

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