These heavy-duty, zip-top (self-sealing) evidence bags are produced from extra-durable polyethylene. Available in 4mil thickness. They are excellent for packaging non-organic items where the possibility of condensation is not a factor. Integrity can be ensured with evidence tape or labels after closure.
We've used these for years, the zip closure is secure but allows you to squeeze excess air out. The varying sizes make it easy to store various sized items and they are always visible.