Ive had both versions of the knapsacks. The Mk2 with the round bottom is much better and is what I use if/when I do enlisted. (Got Promoted back into the officer ranks last month after taking a couple decades off) It took a bit of back and forth, but I think showing that even a skinny 18th Century sized persons equipment taken from the 60th Regiments Packing list would not fit, the size was upped a couple inches in diameter and the round bottom added, that only shows on one Morier painting was made the standard.