SB-900 have internal supports to keep them formed. The lay over the bick and have staps to tie them to the bike. They have rain covers but without them are not water resistant. Others have used them on DL1000 without supports (do a search on SB-900). The CL-850 is the replacement, and is very similar, but different, do a seach for CL-850 as Stromette has them and had the SB-900 and has some good comparison info.
Red 2006 V-Strom 650: "the most shockingly competent machine in the world today"
Alpenkönig (a.k.a. King of the Alps): 2005, 2006
1989 Sportster Bobber Hardtail
1990 Electra Glide with Cop Bags