I've had this old Alice pack for years, and mostly used it for fishing. More recently I've got it out from retirement and started to modify it a bit...(there are loads of Alice mods on the US forums). First mod was to swap the metal buckles for plastic fastex type clips on the top flap and pockets.. Access is now easy and quick.
Second mod was to improve the carry of the pack. The old LC1 straps and kidney pad were very uncomfortable and hard... Made the pack sit on your shoulders and as its big and heavy this was not a viable carry system. So I ordered a set of Molle straps and kidney pad from the US and fitted them. Boy what a difference. Bigger, better padding, sternum strap etc, have now made the pack very comfy to carry even with 15kg of load.
I like some of the army bergens but good ones are over £100. Karrimors Sabres for instance are even more money. So for 10 Euros of clips, and 35$ of straps I have transformed my old Alice into an excellent backpack, that I sure couldcarry for a good distance. It also a pack reputed as virtually indestructable.