Click and Send Labels

So I often reuse post boxes and padded bags for my postage as I receive more than I send. I have been using click and send for my labeling and often use the satchel option as its cheapest.. Even if the item isn't in a satchel... Am I going to get in trouble for this?
Manually calculating postage is always so much more expensive on eBay but I can't afford free postage! Do I have any cheaper options? The stuff I'm sending ranges from tiny things in envelopes to big things that are 11+kg
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I think the only other option you have is to maybe research the new postal group sendle.

 

I've had friends use it and say it is cheaper for the bigger items and they pick up to. I haven't used it as yet though but might be worth a look. Most of my items are smaller:)