Best Outer Sleeves for LPs


Is there a recommended type of plastic sleeve to protect valuable record covers from aging, yellowing, etc? I can buy them very inexpensively from the Princeton Record Exchange, but wondered whether they would have the desired effect. I've also seen poypropylene sleeves sold online at Sleeve City. Any recommendations? Thanks very much!
kb54
I also use the Sleeve City outer sleeves. I have some that I bought over 5 years ago that are still perfectly clear. (Rushton must have meant the uses the 2.5 'mil' sleeve. A 2.5 mm thickness is about an INCH THICK!!!)
I use the 5 mil sleeves as I like the luxury of a sleeve that has heft and will not collapse if empty. (I have about 800 such sleeves now, and certainly plan to buy more.)
(I just hate using the resealable flap style covers... )
Exactly correct, Elizabeth: 2.5 "mil" not "mm." Thanks!

My experience with the 5 mil sleeves is a bit different than Elizabeth's. I liked the heft and that they could stand on their own, but I found that same heft made them more challenging for me to insert LPs easily. And I found the hard edges at the spine of the LP to be sharp and uncomfortable when searching through the shelves for a particular LP. I found the 2.5 mil sleeves to more easily flex to accomodate insertion of the LP and more "finger friendly" when shifting aside the LPs on the shelves.

The nice thing about Sleeve City? They will send you samples of other products with any order. Just click on the "Get a sample" link in the product description. Then choose what works best for you.
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Second on the SLP3 from bagsunlimited. Very durable and not had one split at the seam.
This is another vote for Sleeve City Ultimate Outer 5.0 mil sleeves - a great product from a great company. I also recommend their Mobile Fidelity Master inner Sleeves.
My bad: 2.5 cm is about an inch, not 2.5 mm (which is about a tenth of an inch. When will these dudes realize the metric system is doomed!!!!
(8^Q....
I personally like 'stone' like "he is 5 stone"..
Or great units like 'bushels' .... and 'hands' I think we should measure money in 'hands' (A 'hand' would be a stack of one Euro bills one hand-width high) ((my new measuring rule)
So I could say: "I bought a new preamp and it was only two 'hands'.
The metric system is soooo boring!!