M サイズ のみです。
商品御問い合わせにもお答えできません。
以下英文説明のみ。の代わり、すっごくお安くしました。

The Jam2 is what every fast-packer dreams about. Made with super durable Dyneema? gridstop, it features foam padding in the back for support, and Brock^(TM) foam padding in the spacer mesh shoulder straps for long-lasting comfort. Store items you want quick access to in the large front pocket with a watertight zip and two side angled stretch mesh pockets. Reduce excess pack room as your trip goes on by utilizing the two side compression straps and the comPACKtor system.

* Dyneema gridstop
* Watertight zipper for roomy front pocket
* Comfortable foam back pad
* Space mesh shoulder straps with Brock^(TM) foam padding
* Two side hydration openings with internal hydration sleeve
* Adjustable sternum strap and webbing for hip belt
* Cord lock to secure top closure
* Two angled side mesh pockets with elastic top binding for easy access while wearing
* Ice axe loops with lite-weight elastic cord and pack hook system for closure
* Two side compression straps with quick release buckles
* Top compression
* ComPACKtor system
* Haul Loop

1 lb 5 oz. | 620 g
Volume: 3100 in3